COMP: Fixed linux build warnings

Also fix Subject Hierarchy failing python self tests.

Fixes #3910

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23812 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: 3911. Fixed crash on change of visibility of ModelHierarchy nodes introduced by making them part of SubjectHierarchy.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23813 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: enable parsing of Philips DWI datasets

Philips private tag added to allow parsing multi-b acquisitions as multivolumes by the plugin.


git-svn-id: http://svn.slicer.org/Slicer4/trunk@23814 3bd1e089-480b-0410-8dfb-8563597acbee