Feature in/out Edges convenience functions

[sbaldu]

Add outEdges and inOutEdges functions, that return sets of edges linked to a node (issue #310).

• outEdges returns the DirectedEdges coming out of a node
• inOutEdges returns all the edges contaning a node

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[codecov]

Codecov Report

Merging #357 (84bfeb6) into master (31ac919) will decrease coverage by 0.04%.
Report is 1 commits behind head on master.
The diff coverage is 96.20%.

@@            Coverage Diff             @@
##           master     #357      +/-   ##
==========================================
- Coverage   97.48%   97.44%   -0.04%     
==========================================
  Files          55       55              
  Lines        8745     8961     +216     
==========================================
+ Hits         8525     8732     +207     
- Misses        220      229       +9     

Flag	Coverage Δ
unittests	97.44% <96.20%> (-0.04%)	⬇️

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Files	Coverage Δ
include/CXXGraph/Graph/Graph.hpp	95.57% <100.00%> (+0.06%)	⬆️
test/GraphTest.cpp	98.99% <95.67%> (-0.87%)	⬇️

... and 1 file with indirect coverage changes

[sbaldu]

I'll try to increase coverage

[ZigRazor]

I'll try to increase coverage

Ok, I wait your commit to merge

[sbaldu]

@ZigRazor Ok I've added a few checks. I think you can merge now.