Other implementation of graph algorithms in Graphs.jl

[mojaie]

There may be other implementations of graph algorithms in Graphs.jl

Planarity test
JuliaGraphs/Graphs.jl#208

Maximum cardinality matching
JuliaGraphs/Graphs.jl#291

Discussion in line graph
JuliaGraphs/Graphs.jl#426

Graph algorithms in MolecularGraph.jl should be re-evaluated, and switched to those in Graphs.jl if these are more performant.