Enh/groups core

[kalmarek]

No description provided.

[codecov]

Codecov Report

Merging #31 (0fefd3c) into master (2f90f54) will increase coverage by 1.29%.
The diff coverage is 96.59%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   88.53%   89.83%   +1.29%     
==========================================
  Files          10        9       -1     
  Lines         445      472      +27     
==========================================
+ Hits          394      424      +30     
+ Misses         51       48       -3     

Flag	Coverage Δ
unittests	89.83% <96.59%> (+1.29%)	⬆️

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

Impacted Files	Coverage Δ
src/characters.jl	77.89% <87.50%> (+2.38%)	⬆️
src/projections.jl	84.21% <91.66%> (ø)
src/actions.jl	93.75% <100.00%> (+2.08%)	⬆️
src/cmmatrix.jl	100.00% <100.00%> (ø)
src/dixon.jl	98.18% <100.00%> (ø)
src/eigenspacedecomposition.jl	95.20% <100.00%> (+1.32%)	⬆️

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[kalmarek]

@blegat if you don't see anything jarring, let's merge this, then we can have a chat over examples in SumOfSquares.jl and related topics ;)

[blegat]

Looks good, it even fixes a few issues for SumOfSquares