changed app model - updated operations
Added:
ChangeBidirectionalAssociationToUnidirectional
ChangeUnidirectionalAssociationToBidirectional
CollapseHierarchy
ExtractSubClass
InlineClass
PullUpProperties
PullDOwnProperties
MoveProperties

Removed
PullUp -> special case of PullUpProperties
PushDown ->  speacial case of PushDownProperties
MoveProperty -> specialCase of MoveProperties
SetOpposite -> ChangeToBidir/ChangeToUniDir
MergeClass -> CollapseHierarchy, InlineClass