WIP: custom physical constants for each process

[brian-rose]

Proof-of-concept addressing #120

Here we add a new attribute const to every Process object, which by default is a dictionary of all the standard physical constants.

User can then make modified copies of the dictionary and pass as input to new models.

Currently implemented only for the EBM. For example:

import climlab
from attrdict import AttrDict
e1 = climlab.EBM() 
const2 = AttrDict(e1.const)
const2['a'] *= 2.  # double the radius of the planet 
e2 = climlab.EBM(const=const2) 
e1.step_forward()
e2.step_forward()
# the heat transport is different due to the different sizes
print(e2.heat_transport - e1.heat_transport)

I don't necessarily think this is best implementation but just wanted to see if this works.

[brian-rose]

Note, this does not address the problem that the radiation codes (RRTMG, CAM3) set their own constants at Fortran level. That will require a deeper dive into the Fortran code.

[codecov-io]

Codecov Report

Merging #123 into master will not change coverage.
The diff coverage is 0%.

@@          Coverage Diff          @@
##           master   #123   +/-   ##
=====================================
  Coverage       0%     0%           
=====================================
  Files          66     66           
  Lines        3547   3580   +33     
  Branches      316    316           
=====================================
- Misses       3546   3579   +33     
  Partials        1      1

Impacted Files	Coverage Δ
climlab/model/column.py	0% <0%> (ø)	⬆️
climlab/convection/akmaev_adjustment.py	0% <0%> (ø)	⬆️
climlab/radiation/insolation.py	0% <0%> (ø)	⬆️
climlab/process/time_dependent_process.py	0% <0%> (ø)	⬆️
climlab/utils/thermo.py	0% <0%> (ø)	⬆️
climlab/solar/orbital_cycles.py	0% <0%> (ø)	⬆️
climlab/convection/convadj.py	0% <0%> (ø)	⬆️
climlab/radiation/radiation.py	0% <0%> (ø)	⬆️
climlab/dynamics/meridional_moist_diffusion.py	0% <0%> (ø)	⬆️
climlab/domain/axis.py	0% <0%> (ø)	⬆️
... and 18 more

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