add an explicit warning about what happens if people gapfill pseudoreactions

[exaexa]

Thanks to @oxinabox for highlighting the issue

Closes #78

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9e4be24) to head (89461ba).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #80   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           36        36           
  Lines          584       584           
=========================================
  Hits           584       584           

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[oxinabox]

Might be useful to include example code for identifying such reactions in your universal model?
OTOH automated cleaning PR is coming so maybe can wait for that

[exaexa]

@oxinabox yes that's the topic for #81. Thanks!