declare a public API, export stuff by default, clean up minor things

[exaexa]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b755e4e) to head (1688a4c).

Additional details and impacted files

@@              Coverage Diff               @@
##           mk-ident-map       #31   +/-   ##
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  Coverage        100.00%   100.00%           
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  Files                 6         6           
  Lines               297       297           
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  Hits                297       297           

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[exaexa]

@HettieC re #23 this should basically allow you to just do using AbstractFBCModels and have all function names right in the namespace, yolo way. I guess it does the trick. Old way of doing the import carefully and slowly stays there.