Update the MRB save/restore test to use the slicer util delayDisplay method,
as well as not counting file paths that point to the deleted bundle
expansion directory.
In scene view nodes make sure to also reset the file list
Restore the url and root direcotry after saving a scene to the data bundle
directory so that absolute paths can be calculatediproperly

Issue #3956

git-svn-id: http://svn.slicer.org/Slicer4/trunk@24395 3bd1e089-480b-0410-8dfb-8563597acbee