#444 Added a modal dalog for users, to determine if they want to halt or continue expansions that are bringing a large number of nodes into the graph. I also fixed a bug relating to parsing of properties and relational properties: non-relational ones are not canonnically distinguishable from relational ones, but we can take a guess with no false negatives. I need to cope with 404 errors to complete this work (determine if non-added nodes were not received, or are unavailable). Some bugs were introduced regarding mapping arcs disappearing on parent mouse over, and undo redo oddness involving mappings.
#444 Fixed problem with mappings and the node cap dialog. Things are working well.