Use InChI for Open in Editor if no 3D coordinates
Use InChI for Open in Editor if no 3D coordinates

This changes the OpenInEditorHandler to pass the molecule's
InChI formula to avogadro if the molecule has no 3D coordinates.

Change-Id: Idf676e49ad3d415adb92be1bf4ce67b5155d595b

OpenChemistry/mongochem,OpenChemistry/mongochem,OpenChemistry/mongochem