move a couple methods in SNode
calling of read listeners in snode is implemented
move smodel listeners in place
change listening in nodes
more precise contract in SModelAccessListener
got rid of getPrev/nextChild usages in MPS
got rid of getPrev/nextChild usages in java code
removed SNode.getNext/PrevChild
update SNode read tests
events for nodeAdded/Removed in model
listeners after change
less packages in openapi (asked by evgeny)
attach/detach in module
attach/detach in model
attach/detach in node
fix refs and make
DisposedRepository class
make project
correct read/change access checking in SNode
fix read access tests