Enhancements May22

-generalized node label to hugo, refseq,uniprot
-added evidence objects that contain list of supporting articles to
edge objects
-generalized the R code so don't need a different code for different
networks, just change the in/out files at start of the code.
-Changed collapse algorithm to not stop at training/candidate if below
the maxHop
-Black border on svg
-keep nodes on svg in both the simulation and dragging
-keep training/candidates that don't have connections