Move to openscm conventions

[znicholls]

Pull request

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Example added (either to an existing notebook or as a new notebook, where applicable)
• Description in CHANGELOG.rst added
• check that old API still returns a dict (moved to Move to one backend, not two #161)
• new style returns new style Dataframe (moved to Move to one backend, not two #161)

Adding to CHANGELOG.rst

Please add a single line in the changelog notes similar to one of the following:

- (`#XX <http://link-to-pr.com>`_) Added feature which does something
- (`#XX <http://link-to-pr.com>`_) Fixed bug identified in (`#XX <http://link-to-issue.com>`_)

[rgieseke]

Column headers convention:
Lowercase, underscore, follow Pyam

Variable and acronym naming convention:
use (and enhance) ghgrenamer (https://github.com/openclimatedata/ghgrenamer), "Emissions|N2O|MAGICC AFOLU"

'B' becomes" MAGICC AFOLU"
'I' becomes "MAGICC Fossil and Industrial"

Regional split:
World|Northern Hemisphere|Land
World|R5...
(copy Pyam)

[znicholls]

Regional split:
World|Northern Hemisphere|Land

'World' rather than 'Global' here is jarring but it's better to be consistent with Pyam than precious

[znicholls]

from earlier discussions:

• move to long format only (in preparation for using pyam capability)

[znicholls]

@rgieseke Atmospheric Concentrations|CO2 or Concentrations|CO2, I think the argument for the former is in case we one day introduce an ocean pH module to MAGICC and need Ocean concentrations or similar

[codecov-io]

Codecov Report

Merging #154 into master will increase coverage by 0.4%.
The diff coverage is 98.19%.

@@            Coverage Diff            @@
##           master     #154     +/-   ##
=========================================
+ Coverage   96.33%   96.73%   +0.4%     
=========================================
  Files           4        5      +1     
  Lines         981     1132    +151     
  Branches      134      174     +40     
=========================================
+ Hits          945     1095    +150     
+ Misses         22       20      -2     
- Partials       14       17      +3

Impacted Files	Coverage Δ
pymagicc/utils.py	100% <100%> (ø)
pymagicc/io.py	96.79% <97.97%> (+0.25%)	⬆️
pymagicc/definitions/__init__.py	98.31% <98.23%> (-1.69%)	⬇️

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[znicholls]

@rgieseke this one is pretty massive. Tried to keep it just to the minimum I needed, unfortunately that's quite a lot...

[rgieseke]

Looks good to me!