eval debug:
1) normalise graph to remove the dummy gnodes which have been replaced by boundary vertexes
2) fix the matching function which is used to add gnodes
Merge branch 'master' of github.com:ggrov/tinker

# By plebras
# Via plebras
* 'master' of github.com:ggrov/tinker:
  enabled eval options only if user select node with goal before, and added step into and step over options if it is nested node
  fixed bug with breakpoints