Removed priority based streaming and fast path.

Removed priority based streaming and fast path codes in
preparation for future refactoring. These were polluting core
classes despite having a small user base. In the future, they
may be refactored into the appropriate subclasses and "plugins".

Change-Id: I54562546688c6de468b0068e9b6c65e49c5ec269
Remove WindowLevelInterface.tcl and WindowLevelInterface.py

This is a code fragment providing an interface to a viewer of
type vtkImageViewer. It seems to be just a helper used to setting the window
level etc. in the viewer.

I am proposing that this code be removed.

If there is a need to test Tkinter stuff then Attenuation.tcl from the
VTK Text Book exercises would be a good candidate. I have converted this to
VTK 6 and also written a Python version of it.

Marcus pointed out that Imaging/Core/Testing/Python/WindowLevelInterface.py
and has syntax errors and that this and the Tcl version are never run.

This arose from the VTK hackathon.

Change-Id: Ic57d8940a240e1939051f4e68d5a329bac645918
Signed-off-by: Andrew Maclean <andrew.amaclean@gmail.com>
Merge topic 'delete-WindowLevelInterface' into master

1bc76b6d Remove WindowLevelInterface.tcl and WindowLevelInterface.py
COMP: Missing NO_VALID

Tests that do not have baseline images for regression testing must use
the NO_VALID modifier to avoid cmake warnings.

Change-Id: I083e48e4f5cceecc0a26146513b4581360dc76f0
Merge topic 'removed-priority-streaming' into master

575ebda2 Removed priority based streaming and fast path.
Merge topic 'Configuration_ValidData' into master

84087f54 COMP: Missing NO_VALID
- Follow on commit to use the right style #include ("", not <>)

Thanks to Marcus for pointing out the subtle difference.

Change-Id: I24715440fa744267d0bda3c53494e738f7223e0f
Merge topic 'Coverage_CornerAnnotation' into master

67cf4826 - Follow on commit to use the right style #include ("", not <>)
ENH: Improve code coverage script

Change-Id: Id530d6e9c12cc0098931bd5c9a06924a15935579
Merge topic 'CodeCoverageScript' into master

0e9cfd9b ENH: Improve code coverage script
Improve implementation of Catalyst viewer

Change-Id: Ibf305a1ea35b426e35dd43caf263861bdcb69381
Merge topic 'catalyst-web' into master

697d1785 Improve implementation of Catalyst viewer