COMP: Fix error when building against Qt not having SSL support.

Commit r22782 was done under the assumption that Qt would be built with SSL
support. This commit ensures Qt with/without SSL support is supported.

Note that the build system could be improved to detect with Qt has
OpenSSL support, if this is the case, the OpenSSL project could be
automatically enabled unless explicitly disabled.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22799 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: fix updating fiducials after scene load

After loading a scene, changing the display properties of
a fiducial list was not being reflected in the 2d and 3d
views. There was a missing event observation in the
Markups displayable managers, adding in 
vtkMRMLDisplayableNode::DisplayModifiedEvent
to the list of events observed on a markups node
fixed the problem.

Issue #3480



git-svn-id: http://svn.slicer.org/Slicer4/trunk@22800 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Fix reading of DWI files. Fixes #3545

This commit fixes regression introduced by commit r22753 fixing issue #3511
that was preventing "vtkNRRDReader::CanReadFile" from returning the correct
value.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22801 3bd1e089-480b-0410-8dfb-8563597acbee
STYLE: Consistently report error in vtkMRMLNRRDStorageNode read/write method

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22802 3bd1e089-480b-0410-8dfb-8563597acbee
STYLE: Cleanup ROI widget and representation

Add vtkMRMLDisplayNode::GetBounds() utility method.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22803 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Cleanup ROI widget and representation

This reverts commit r22803 inadvertently pushed.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22804 3bd1e089-480b-0410-8dfb-8563597acbee
STYLE: Add X,O,M and S documentation for VolumeRendering module

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22805 3bd1e089-480b-0410-8dfb-8563597acbee