[mcflugen]

As @mdpiper has voiced, the similar bmipy and BMI version numbers can make it unclear which identifies the package release and which identifies the supported BMI specification.

I've made some changes that I hope make this more clear and will also allow for supporting additional BMI specifications. For example, a preliminary BMI 3.0 (I imagine this will be in bmipy.bmi3_0_draft or something similar).

• Use bmipy.bmi2_0 as the explicit import for BMI 2.0. This contains the BMI_VERSION constant alongside Bmi that gives the supported BMI version.
• I've kept package-level and bmipy.bmi imports for backward compatibility.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.87%. Comparing base (10353e4) to head (661a1ec).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   97.84%   97.87%   +0.03%     
==========================================
  Files          10       11       +1     
  Lines         371      377       +6     
==========================================
+ Hits          363      369       +6     
  Misses          8        8              

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