add Apache2.0 license

[nhoening]

TODO:

• add license
• mention license in package meta data and for new pull requests
• Check exceptions in api package (@nhoening)
• Check exceptions in data package (@nhoening)
• Check exceptions in documentation package (@nhoening)
• Check exceptions in ui package (@Flix6x)
• Check exceptions in utils package (@Flix6x)
• Add NOTICE file if needed
• Check dependencies for incompatible licenses
• Replace pysolar (GPL-3)
• Replace pyerf (GPL-3)
• Add "Credits" section (e.g. modal box in footer) to attribute Flaticon and Unsplash (@Flix6x)

[nhoening]

About checking for GPL dependencies:

I've been checking our requirements/.txt files as we keep these files in the code and thus link to the libraries in there, even if they are not direct dependencies.

± python -m third_party_license_file_generator -r requirements/app.txt -r requirements/dev.txt -r requirements/test.txt -p ~/envs/sempras/bin/python -g -c

mixing requirements paths and Python paths together as follows:
	'requirements/app.txt' - '/home/nicolas/envs/sempras/bin/python'
working on license summary...
handling 'requirements/app.txt' with '/home/nicolas/envs/sempras/bin/python' ...
Apache-2.0
	'arrow' by 'Chris Smith <crsmithdev@gmail.com>' ('https://arrow.readthedocs.io')
	'bcrypt' by 'The Python Cryptographic Authority developers <cryptography-dev@python.org>' ('https://github.com/pyca/bcrypt/')
	'packaging' by 'Donald Stufft and individual contributors <donald@stufft.io>' ('https://github.com/pypa/packaging')
	'properscoring' by 'The Climate Corporation <eng@climate.com>' ('https://github.com/TheClimateCorporation/properscoring')
	'python-dateutil' by 'Gustavo Niemeyer <gustavo@niemeyer.net>' ('https://dateutil.readthedocs.io')
	'python-editor' by 'Peter Ruibal <ruibalp@gmail.com>' ('https://github.com/fmoo/python-editor')
	'requests' by 'Kenneth Reitz <me@kennethreitz.org>' ('https://requests.readthedocs.io')
	'requests-file' by 'David Shea <reallylongword@gmail.com>' ('http://github.com/dashea/requests-file')
	'selenium' by 'UNKNOWN <UNKNOWN>' ('https://github.com/SeleniumHQ/selenium/')
	'timetomodel' by 'Seita BV <nicolas@seita.nl>' ('https://github.com/seitabv/timetomodel')
	'tornado' by 'Facebook <python-tornado@googlegroups.com>' ('http://www.tornadoweb.org/')
BSD-2-clause
	'patsy' by 'Nathaniel J. Smith <njs@pobox.com>' ('https://github.com/pydata/patsy')
BSD-3-clause
	'Flask' by 'Armin Ronacher <armin.ronacher@active-4.com>' ('https://palletsprojects.com/p/flask/')
	'Jinja2' by 'Armin Ronacher <armin.ronacher@active-4.com>' ('https://palletsprojects.com/p/jinja/')
	'MarkupSafe' by 'Armin Ronacher <armin.ronacher@active-4.com>' ('https://palletsprojects.com/p/markupsafe/')
	'Werkzeug' by 'Armin Ronacher <armin.ronacher@active-4.com>' ('https://palletsprojects.com/p/werkzeug/')
	'altair' by 'Brian E. Granger / Jake VanderPlas <jakevdp@gmail.com>' ('http://altair-viz.github.io')
	'bokeh' by 'Anaconda <info@anaconda.com>' ('http://github.com/bokeh/bokeh')
	'click' by None ('https://palletsprojects.com/p/click/')
	'colour' by 'Valentin LAB <valentin.lab@kalysto.org>' ('http://github.com/vaab/colour')
	'cycler' by 'Thomas A Caswell <matplotlib-users@python.org>' ('http://github.com/matplotlib/cycler')
	'idna' by 'Kim Davies <kim@cynosure.com.au>' ('https://github.com/kjd/idna')
	'isodate' by 'Gerhard Weis <gerhard.weis@proclos.com>' ('https://github.com/gweis/isodate/')
	'itsdangerous' by 'Armin Ronacher <armin.ronacher@active-4.com>' ('https://palletsprojects.com/p/itsdangerous/')
	'joblib' by 'Gael Varoquaux <gael.varoquaux@normalesup.org>' ('https://joblib.readthedocs.io')
	'kiwisolver' by 'The Nucleic Development Team <sccolbert@gmail.com>' ('https://github.com/nucleic/kiwi')
	'numpy' by 'Travis E. Oliphant et al.' ('https://www.numpy.org')
	'pandas' by None ('https://pandas.pydata.org')
	'passlib' by 'Eli Collins <elic@assurancetechnologies.com>' ('https://bitbucket.org/ecollins/passlib')
	'ply' by 'David Beazley <dave@dabeaz.com>' ('http://www.dabeaz.com/ply/')
	'pscript' by 'Almar Klein and contributors <almar.klein@gmail.com>' ('http://pscript.readthedocs.io')
	'pycparser' by 'Eli Bendersky <eliben@gmail.com>' ('https://github.com/eliben/pycparser')
	'python-dotenv' by 'Saurabh Kumar <me+github@saurabh-kumar.com>' ('https://github.com/theskumar/python-dotenv')
	'rq' by 'Vincent Driessen <vincent@3rdcloud.com>' ('https://github.com/nvie/rq/')
	'rq-dashboard' by 'Vincent Driessen <vincent@3rdcloud.com>' ('https://github.com/Parallels/rq-dashboard')
	'scikit-learn' by None ('http://scikit-learn.org')
	'scipy' by None ('https://www.scipy.org')
	'speaklater' by 'Armin Ronacher <armin.ronacher@active-4.com>' ('http://github.com/mitsuhiko/speaklater')
	'statsmodels' by None ('https://www.statsmodels.org/')
	'threadpoolctl' by 'Thomas Moreau <thomas.moreau.2010@gmail.com>' ('https://github.com/joblib/threadpoolctl')
	'tldextract' by 'John Kurkowski <john.kurkowski@gmail.com>' ('https://github.com/john-kurkowski/tldextract')
	'toolz' by 'https://raw.github.com/pytoolz/toolz/master/AUTHORS.md' ('https://github.com/pytoolz/toolz/')
	'xlrd' by 'John Machin <sjmachin@lexicon.net>' ('http://www.python-excel.org/')
GPL-3.0
	'pyerf' by 'Douglas Thor <doug.thor@gmail.com>' ('https://www.github.com/dougthor42/pyerf')
	'pysolar' by 'Brandon Stafford <brandon@pingswept.org>' ('http://pysolar.org')
ISC
	'dnspython' by 'Bob Halley <halley@dnspython.org>' ('http://www.dnspython.org')
	'email-validator' by 'Joshua Tauberer <jt@occams.info>' ('https://github.com/JoshData/python-email-validator')
LGPL-3.0
	'chardet' by 'Daniel Blanchard <dan.blanchard@gmail.com>' ('https://github.com/chardet/chardet')
	'nose' by 'Jason Pellerin <jpellerin+nose@gmail.com>' ('http://readthedocs.org/docs/nose/')
	'openturns' by 'OpenTURNS Developers <users@openturns.org>' ('http://www.openturns.org')
	'psycopg2-binary' by 'Federico Di Gregorio <fog@initd.org>' ('https://psycopg.org/')
MIT
	'SQLAlchemy' by 'Mike Bayer <mike_mp@zzzcomputing.com>' ('http://www.sqlalchemy.org')
	'alembic' by 'Mike Bayer <mike@zzzcomputing.com>' ('https://alembic.sqlalchemy.org')
	'appdirs' by 'Trent Mick <trentm@gmail.com>' ('http://github.com/ActiveState/appdirs')
	'attrs' by 'Hynek Schlawack <hs@ox.cx>' ('https://www.attrs.org/')
	'cffi' by 'Armin Rigo, Maciej Fijalkowski <python-cffi@googlegroups.com>' ('http://cffi.readthedocs.org')
	'entrypoints' by 'Thomas Kluyver <thomas@kluyver.me.uk>' ('https://github.com/takluyver/entrypoints')
	'filelock' by 'Benedikt Schmitt <benedikt@benediktschmitt.de>' ('https://github.com/benediktschmitt/py-filelock')
	'flask-marshmallow' by 'Steven Loria <sloria1@gmail.com>' ('https://github.com/marshmallow-code/flask-marshmallow')
	'humanize' by 'Jason Moiron <jmoiron@jmoiron.net>' ('https://github.com/jmoiron/humanize')
	'inflect' by 'Paul Dyson <pwdyson@yahoo.com>' ('https://github.com/jazzband/inflect')
	'inflection' by 'Janne Vanhala <janne.vanhala@gmail.com>' ('https://github.com/jpvanhal/inflection')
	'iso8601' by 'Michael Twomey <micktwomey+iso8601@gmail.com>' ('https://bitbucket.org/micktwomey/pyiso8601')
	'jsonschema' by 'Julian Berman <Julian@GrayVines.com>' ('https://github.com/Julian/jsonschema')
	'marshmallow' by 'Steven Loria <sloria1@gmail.com>' ('https://github.com/marshmallow-code/marshmallow')
	'marshmallow-sqlalchemy' by 'Steven Loria <sloria1@gmail.com>' ('https://github.com/marshmallow-code/marshmallow-sqlalchemy')
	'pandas-bokeh' by 'Patrik Hlobil <patrik.hlobil@googlemail.com>' ('https://github.com/PatrikHlobil/Pandas-Bokeh')
	'pyparsing' by 'Paul McGuire <ptmcg@users.sourceforge.net>' ('https://github.com/pyparsing/pyparsing/')
	'pyrsistent' by 'Tobias Gustafsson <tobias.l.gustafsson@gmail.com>' ('http://github.com/tobgu/pyrsistent/')
	'pytz' by 'Stuart Bishop <stuart@stuartbishop.net>' ('http://pythonhosted.org/pytz')
	'redis' by 'Andy McCurdy <sedrik@gmail.com>' ('https://github.com/andymccurdy/redis-py')
	'setuptools' by 'Python Packaging Authority <distutils-sig@python.org>' ('https://github.com/pypa/setuptools')
	'six' by 'Benjamin Peterson <benjamin@python.org>' ('https://github.com/benjaminp/six')
	'timely-beliefs' by 'Seita BV <felix@seita.nl>' ('https://github.com/seitabv/timely-beliefs')
	'tzlocal' by 'Lennart Regebro <regebro@gmail.com>' ('https://github.com/regebro/tzlocal')
	'urllib3' by 'Andrey Petrov <andrey.petrov@shazow.net>' ('https://urllib3.readthedocs.io/')
MPL-2.0
	'certifi' by 'Kenneth Reitz <me@kennethreitz.com>' ('https://certifiio.readthedocs.io/en/latest/')
Python-2.0
	'matplotlib' by 'John D. Hunter, Michael Droettboom <matplotlib-users@python.org>' ('https://matplotlib.org')
Unknown (assumed commercial)
	'sklearn' by 'UNKNOWN <UNKNOWN>' ('https://pypi.python.org/pypi/scikit-learn/')

Sklearn has a BSD-3-Clause License so this is one the tool could not figure out.

We'll replace pyerf and pysolar.