init branch
starting with the review process to adapt methods to new optional option
some progress on the adaptation to optional
some progress on the adaptation to optional
some progress on the adaptation to optional
some progress on the adaptation to optional
finishing update of Protein class to comply with Optional stuff
finishing update for Optional stuff in vertex classes
adding missing edge class ProteinIsoform plus creation of these edges on ImportUniprot
fix at ImportUniprotGO regarding name of log file
adding ImportUniprotNCBITaxonomy class
adding missing ImportNCBITaxonGenInfoIndex class
minor fix at ImportNCBITaxonGenInfoIndex
a few minor fixes at importers regarding log names
fix at method name for UniRefCluster classes
refactoring a few utility methods with obsolote names in Protein class
fix at ImportUniprotEnzymeDB
minor refactor in ImportGenInforNCBITaxon
Merge branch 'feature/add/optional/arities'