structure for CV

[larsbuntemeyer]

implement CMIP6 Cordex vocabulary:

• adds mip_era keyword to cx.cordex_domain
• rename short_name to domain_id keyword

closes #110

[codecov-commenter]

Codecov Report

Merging #129 (99ac8ef) into master (b86969a) will increase coverage by 0.08%.
The diff coverage is 91.42%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   80.95%   81.04%   +0.08%     
==========================================
  Files          23       23              
  Lines        1239     1250      +11     
==========================================
+ Hits         1003     1013      +10     
- Misses        236      237       +1     

Flag	Coverage Δ
unittests	81.04% <91.42%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cordex/domain.py	81.70% <90.00%> (+1.18%)	⬆️
cordex/cf.py	100.00% <100.00%> (ø)
cordex/transform.py	96.36% <100.00%> (-0.91%)	⬇️