v2.2 dev

[chrisroadmap]

Pull request

Please confirm that this pull request has done the following:

• [x] Tests added
• [ ] Documentation added (where applicable)
• [ ] Example added (either to an existing notebook or as a new notebook, where applicable)
• [x] Description in CHANGELOG.rst added
• [ ] #121
• [x] #122
• [x] #125
• [ ] #126
• [ ] #133
• [x] #134
• [ ] #136
• [x] #153

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (31ed7a9) to head (760f91e). Report is 30 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #132 +/- ## =========================================== + Coverage 95.08% 100.00% +4.91% =========================================== Files 19 20 +1 Lines 732 711 -21 Branches 105 108 +3 =========================================== + Hits 696 711 +15 + Misses 16 0 -16 + Partials 20 0 -20 ```

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[chrisroadmap]

There are too many changes to implement in a v2.2 release here - so will prioritise a new emissions importer from IamDataFrame-like databases along with the changes already made, then bundle up and release.