Add `PancakeGraph`

[james-d-mitchell]

[codecov[bot]]

Codecov Report

Merging #403 (2232361) into master (0c909dd) will increase coverage by 0.24%. The diff coverage is 98.48%.

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
+ Coverage   97.01%   97.25%   +0.24%     
==========================================
  Files          45       45              
  Lines       12884    12499     -385     
==========================================
- Hits        12499    12156     -343     
+ Misses        385      343      -42     

Impacted Files	Coverage Δ
gap/examples.gi	98.68% <96.29%> (-0.24%)	:arrow_down:
gap/examples.gd	100.00% <100.00%> (ø)
gap/grape.gd	100.00% <100.00%> (ø)
gap/grape.gi	99.50% <100.00%> (+0.62%)	:arrow_up:
src/bitarray.c	93.33% <0.00%> (-1.91%)	:arrow_down:
src/planar.c	93.75% <0.00%> (-0.37%)	:arrow_down:
src/perms.c	77.77% <0.00%> (-0.35%)	:arrow_down:
src/homos-graphs.c	98.66% <0.00%> (-0.27%)	:arrow_down:
src/homos.c	99.08% <0.00%> (-0.07%)	:arrow_down:
src/cliques.c	99.26% <0.00%> (-0.04%)	:arrow_down:
... and 11 more

[olexandr-konovalov]

@james-d-mitchell merge conflicts now should be resolved...

[marinaanagno]

Just a reminder, there is a pull request on this branch about the burnt pancake graph (which has to do with signed permutations). I haven't finished documented it yet, but I guess I should do this and @james-d-mitchell should approve before merging this into master, if we still want burnt pancake as a family of graphs in digraphs :)

[github-actions[bot]]

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