Move signals CursorAdded, CursorRemoved and CursorMoved to ops.Document.
This makes SvgSelectionView independent from ops.OdtDocument.
Move signalMemberUpdated, signalMemberRemoved and signalMemberAdded from ops.OdtDocument to ops.Document.
Merge pull request #378 from vandenoever/remdep

Move signals CursorAdded, CursorRemoved and CursorMoved to ops.Document.