Filter _step_files based on table data

[lang-m]

Remove duplicated data, requires ubermag/ubermagtable#50

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (72f5c2a) 96.02% compared to head (3d500a5) 96.04%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   96.02%   96.04%   +0.02%     
==========================================
  Files           7        7              
  Lines         352      354       +2     
==========================================
+ Hits          338      340       +2     
  Misses         14       14              

Impacted Files	Coverage Δ
micromagneticdata/oommfdrive.py	94.44% <100.00%> (+0.32%)	⬆️

... and 1 file with indirect coverage changes

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