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Draft: construct pangenome database from GFA

Workum, Dirk-Jan van requested to merge add_gfa_build_pangenome into add_gfa_export

Related to !147, I would like to not only go from pantools_DB -> GFA but also vice versa. This merge request collects my tries of doing that. It's marked as draft for now because I'm not sure if I'll use this code in the end.

TODO:

  • Fix kmer index
  • Make working on cyclic graphs
  • Find out what happens with degenerate nodes
  • Don't require genome locations file if GFA is provided (if GFA contains sequences)
  • Get it to run on any valid GFA
  • Ensure neo4j -> GFA -> neo4j gives identical database
  • Ensure GFA -> neo4j -> GFA gives identical GFA file
  • Update documentation accordingly
Edited by Workum, Dirk-Jan van

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