add Apache2.0 license, replace solarpy with pvlib (#16)

* add Apache2.0 license and mention it

* clear up how our code relates to the sqlalchemy_schemadisplay project

* remove unused code, fix typo

* remove whitespace

* add NOTICE mentioning Seita and the year development started

* Typos.

* remove appendix which deals with adding a notice to every file

* add copyright owners and licenses for things in our sphinx theme

* solar irradiation comparison script

* Add credits to UI.

Signed-off-by: F.N. Claessen <felix@seita.nl>

* Fix use of solarpy.

* Check solarpy for clear sky irradiance.
Add location on southern hemisphere.

* Black.

* Update dependency replacing pyerf.

* plot the outcomes of solar irradiation testing

* add information about sunrise, noon and sunset

* also plot dawn and dusk; remove flexmeasures dependency of test script

* replace pysolar with pvlib to compute irradiation

* update pre-commit repo tags

* Distinguish between irradiance metrics.

* Switch to empirically validated function.

* Update links in Credits modal.

* make main Readme more about general benefits, show pics and move installation and developer advice to other files

* fix some links

Co-authored-by: F.N. Claessen <felix@seita.nl>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,2 @@
+- [ ] I agree to contribute to the project under Apache 2 License. 
+- [ ] To the best of my knowledge, the proposed patch is not based on a code under GPL or other license that is incompatible with FlexMeasures

.pre-commit-config.yaml

@@ -1,12 +1,12 @@
 repos:
 -   repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.3
+    rev: 3.8.4
     hooks:
     - id: flake8
       name: flake8 (code linting)
       language_version: python3.8
 -   repo: https://github.com/psf/black
-    rev: stable
+    rev: 20.8b1
     hooks:
     - id: black
       name: black (code formatting)

Developing.md

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+# Developing for FlexMeasures
+
+Note: For developers, there is more detailed documentation available. Please consult the documentation next to the relevant code:
+
+* [General coding tips and maintenance](flexmeasures/Readme.md)
+* [Continuous Integration](ci/Readme.md)
+* [Database management](flexmeasures/data/Readme.md)
+* [API development](flexmeasures/api/Readme.md)
+
+
+## Virtual environment
+
+* Make a virtual environment: `python3.8 -m venv flexmeasures-venv` or use a different tool like `mkvirtualenv` or virtualenvwrapper. You can also use
+  an [Anaconda distribution](https://conda.io/docs/user-guide/tasks/manage-environments.html) as base with `conda create -n flexmeasures-venv python=3.8`.
+* Activate it, e.g.: `source flexmeasures-venv/bin/activate`
+
+
+## Dependencies
+
+Install all dependencies including the ones needed for development:
+
+    make install-for-dev
+
+## Run locally
+
+Now, to start the web application, you can run:
+
+    python flexmeasures/run-local.py
+
+And access the server at http://localhost:5000
+
+
+## Tests
+
+You can run automated tests with:
+
+    make test
+
+which behind the curtains installs dependencies and calls pytest.
+
+A coverage report can be created like this:
+
+    pytest --cov=flexmeasures --cov-config .coveragerc
+
+You can add --cov-report=html after which a htmlcov/index.html is generated.
+
+It's also possible to use:
+
+    python setup.py test

Installation.md

@@ -0,0 +1,76 @@
+# Building & Running FlexMeasures
+
+
+## Dependencies
+
+Install dependencies and the `flexmeasures` platform itself:
+
+      make install
+
+## Configure environment
+
+* Set an env variable to indicate in which environment you are operating (one out of development|testing|staging|production), e.g.:
+
+    `echo "FLASK_ENV=development" >> .env`
+
+    `export FLASK_ENV=production`
+* If you need to customise settings, create `flexmeasures/<development|testing|staging|production>_config.py` and add required settings.
+  If you're unsure what you need, just continue for now and the app will tell you what it misses.
+
+## Make a secret key for sessions
+
+    mkdir -p /path/to/flexmeasures/instance
+    head -c 24 /dev/urandom > /path/to/flexmeasures/instance/secret_key
+
+## Preparing the time series database
+
+* Make sure you have a Postgres (Version 9+) database. See `data/Readme.md` for instructions on this.
+* Tell `flexmeasures` about it. Either you are using the default for the environment you're in (see `flexmeasures/utils/config_defaults`),
+   or you can configure your own connection string: In `flexmeasures/<development|testing|staging|production>_conf.py`,
+  set the variable `SQLALCHEMY_DATABASE_URI = 'postgresql://<user>:<password>@<host-address>[:<port>]/<db>'`
+* Run `flask db upgrade` to create the Postgres DB structure.
+
+## Preparing the job queue database
+
+To let FlexMeasures queue forecasting and scheduling jobs, install a Redis server and configure access to it within FlexMeasures' config file (see above). You can find the default settings in `flexmeasures/utils/config_defaults.py`.
+
+TODO: more detail
+
+## Install an LP solver
+
+For planning balancing actions, the flexmeasures platform uses a linear program solver. Currently that is the Cbc solver. See the `FLEXMEASURES_LP_SOLVER` config setting if you want to change to a different solver.
+
+Installing Cbc can be done on Unix via:
+
+    apt-get install coinor-cbc
+
+(also available in different popular package managers).
+
+We provide a script for installing from source (without requiring `sudo` rights) in [the CI Readme](ci/Readme.md).
+
+More information (e.g. for installing on Windows) on [the website](https://projects.coin-or.org/Cbc).
+
+
+## Run
+
+Now, to start the web application, you can run:
+
+    python flexmeasures/run-local.py
+
+But in a production context, you shouldn't run a script - hand the `app` object to a WSGI process, as your platform of choice describes.
+
+Often, that requires a WSGI script. We provide an example WSGI script in [the CI Readme](ci/Readme.md).
+
+
+## Loading data
+
+If you have a SQL Dump file, you can load that:
+
+    psql -U {user_name} -h {host_name} -d {database_name} -f {file_path}
+
+Else, you can populate some standard data, most of which comes from files:
+
+* Finally, run `flask db_populate --structure --data --small` to load this data into the database.
+  The `--small` parameter will only load four assets and four days, so use this first to try things out. TODO: check which command is possible at the moment. Also add a TODO saying where we want to go with this (support for loading data).
+
+

LICENSE

@@ -0,0 +1,174 @@
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NOTICE

@@ -0,0 +1,7 @@
+FlexMeasures
+Copyright 2018 Seita Energy Flexibility
+Apache 2.0 license
+
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