added fractional_chromatic_number, fractional_clique_number

[dstahlke]

Uses JuMP with the GLPK backend.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.21% 🎉

Comparison is base (8a43175) 98.94% compared to head (2be2e36) 99.15%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   98.94%   99.15%   +0.21%     
==========================================
  Files           5        6       +1     
  Lines          95      119      +24     
==========================================
+ Hits           94      118      +24     
  Misses          1        1              

Files Changed	Coverage Δ
src/GraphsOptim.jl	100.00% <ø> (ø)
src/fractional_coloring.jl	100.00% <100.00%> (ø)

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[gdalle]

Hey! I have seen the PR and I'm grateful for the contribution, but I don't have time to review rn, hopefully in the coming weeks. Do you need this urgently?

[dstahlke]

No hurry. Take your time.

[dstahlke]

All issues fixed.

[codecov]

Codecov Report

Merging #13 (0b11720) into main (22cb219) will decrease coverage by 1.32%.
The diff coverage is 92.85%.

@@             Coverage Diff             @@
##              main      #13      +/-   ##
===========================================
- Coverage   100.00%   98.68%   -1.32%     
===========================================
  Files            6        7       +1     
  Lines          124      152      +28     
===========================================
+ Hits           124      150      +26     
- Misses           0        2       +2     

Files	Coverage Δ
src/GraphsOptim.jl	100.00% <ø> (ø)
src/utils.jl	100.00% <100.00%> (ø)
src/fractional_coloring.jl	91.66% <91.66%> (ø)