Generalize the OPMThing functionality to be used for OPMNode instances.

[vainolo]

Generalize the OPMThing functionality to be used for OPMNode instances.

[vainolo]

• OPMThingComponentEditPolicy - can be made generic for node, Need to make OPMThingDeleteCommand generic.
• OPMThingDeleteCommand - Cannot generalize because OPMNode does not declare getOPD function, only declared in OPMThing.
• Model - moved opd reference from OPMThing to OPMNode. Changed named of reference things of OPMObjectProcessDiagram to nodes. generated code.
• OPMModelUtils - had to update because of change in the mode.

[vainolo]

• OPMObjectProcessDiagramEditPart - getModelChildren now returns list of nodes and not list of things.

[vainolo]

• Executed application. Works. Commiting work in progress. Lots of changes seen in code because of new formatting that uses spaces instead of tabs.

[vainolo]

• Changed OPMThingDeleteCommand to OPMNodeDeleteCommand, now works for generic OPMNode instances.
• Changed OPMThingComponentEditPolicy to OPMNodeComponentEditPolicy, now works for generic OPMNode instances.
• Transfered OPMNodeComponentEditPolicy from OPMThingEditPart to OPMNodeEditPart.
• Changed OPMLinkCreateCommand to use OPMNode instead of OPMThing as source and target.
• Changed OPMThingGraphicalNodeEditPolicy to OPMNodeGraphicalNodeEditPolicy. now works for generig OPMNode instances.
• Transfered OPMNodeGraphicalNodeEditPolicy from OPMThingEditPart to OPMNodeEditPart.
• Executed editor. Things still work. Commiting work in progress.

[vainolo]

• Changes OPMThingCreateCommand to work also for generic nodes. This required changes in the model so that the constraints are now part of the OPMNode and not of the OPMThing. Default constraints for OPMThing instances are stored in the EditPolicy that calls the OPMNodeCreateCommand. Since the command now works with OPMNode instances we had to remove setting a default name for the OPMThing and did this in the model using a default value (which is anyway better).

[vainolo]

• Changed OPMThingChangeConstraintCommand to work with OPMNode.