Fix ConvertTRE test baseline

Following 054b4b3de6be006b1526f71ffcdbf23ca37663ca, we need to update
ConvertTRE baseline to make sure the test compare with a correct tube file.

Change-Id: I6b01a2a8347cc517c688c123ba3f31b4ee94cd97
Merge pull request #331 from vovythevov/MiscTubeTKFixes

Fix ConvertTRE test baseline
BUG: Do not build Python extensions when building Slicer modules.

There is an incompatibility between IPython and Slicer's Python.
Merge pull request #332 from thewtex/PythonSlicer

BUG: Do not build Python extensions when building Slicer modules.
Fix scale normalization

The scale normalization would provide the opposite effect than expected.
Change the radius to be spacing*scale instead.
So we have on a 0.05*0.05*0.05 image with a scale of 2.0 a radius of 0.1
instead of 40.

Also remove debug mode on the ridge operator to improve perfomances.
Merge pull request #333 from vovythevov/SegmentTubes-FixScale

Fix scale normalization
Fix SegmentTubes error message
Merge pull request #334 from vovythevov/SegmentTubes-FixScale

Fix SegmentTubes error message
Revert "Fix scale normalization"

This reverts commit 5063c712f9b7b7a877423f16975e502ac72adc42.
The radius normalization was an error, we need the scale to be interpreted
in term of voxel size.
Merge pull request #335 from vovythevov/Revert-SegmentTubes-FixScale

Revert "Fix scale normalization"
ENH: MergeAdjacentImages can now be passed an initial transform
BUG: Fixes transform/inverse for initial bounding box and resampling
Merge pull request #336 from aylward/MergeAdjacentInitTransform

Merge adjacent init transform