BUG: Ensure "slicer.module{mrml, logic, widget}" are populated for MacOSX extensions

Also revert commit r20784 which wasn't solving the root cause of the
problem. Additional invalid python paths were added.

Commit r20852 should also probably be reverted, more investigation will
be required to confirm that hypothesis.

See http://na-mic.org/Mantis/view.php?id=2358

Fixes #2358

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21075 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: separate out the abdomen and knee tests to make tracking errors easier

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21076 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Add resize grip into Models module tree view

It allows the user to decide the size of the tree view.
Issue #2433 (and related)

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21077 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: improve printing of sample data downloads for readability

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21078 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Further refine the size grip behavior in Models module

Issue #2433

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21079 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Crash when applying transform on multiple selection

When transform is applied on first model index,
the model is update which invalidates other selected model indexes.
Closes #2578

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21080 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Axis label visibility was not applied on scene close

Observing camera when changed allows the labels to be hidden
when the camera is modified.
Regression due to MRML view nodes being singletons.
Closes #2581

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21081 3bd1e089-480b-0410-8dfb-8563597acbee
STYLE: Cleanup ctkMRMLViewDisplayableManager

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21082 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Don't sort files in Add Data dialog by default

Closes #1816

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21083 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Fix Data module tree view auto size

Setting the minimumSize on the widget prevents the minimumSizeHint from
being used.
Use instead minSizeHint to enforce a minimum size of the widget.
Closes #2582

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21084 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Crash in vtkMRMLViewDisplayableManager at start-up

UpdateAxis is now indirectly called in the destructor of
vtkMRMLViewDisplayableManager.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21085 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: files with no PixelData tag should be ignored

Some series come with extra files which are of Modality MR, but have
no PixelData - for example the vegetable scans here:
http://www.insight-journal.org/midas/collection/view/194

So we skip these and process only the multiframe pixel data.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21086 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: 2494. Fixed tutorial tests to work with latest Slicer HEAD

Renaming VTKSliceView to SliceView
Renaming "Tractography Fiducial Seeding Module" to "Tractography
Interactive Seeding Module"
CurrentNodeChanged issues