Corrections to solve 0022648: [CEA 1217]:

Corrections to solve 0022648: [CEA 1217]:
1) GenericGui.cxx: ignore null (expx,expy) at loading XML schema and use (x,y) in this case;
2) GenericGui.cxx and SceneNodeItem.cxx: use expanded position of node in Shrink state and correct this position at loading XML schema if it is needed;
3) SceneProcItem.cxx: rebuild links after Shrink/Expand operation.