Small restructuring
Fixed menu's and added info on selected items (edges, nodes) in connection manager
Only enable connect and disconnect button when an edge is selected
Colored green on connected edges, buttons are now enabled based on isconnected
Working connect and disconnect buttons! Added result status bar.
New colors, better layout, better name and caught an error, updated cytoscape.js
Added unconnectability
Merge branch 'development' of github.com:flexiblepower/fpai-core into messaging-ui
Made sure that null messages or null MessageHandler are handled better

This also improves the readability of the PotentialConnectionImpl a bit,
but it is still quite complex.
Merge remote-tracking branch 'origin/messaging-ui' into development