Add block amount of detail information key

Change-Id: I485c0f934e9f69b4f8ecba782cd47eb914262627
Block opacity and color are now more independent

Block opacity can be set while still showing the colormap of the data.
Block color must now be set in order to override the mapper's color map.
Only works when Interpolate Scalars Before Mapping is on and
SetColorModeToMapScalars() has been called (if you want the backface
visible).

Change-Id: I159eeeb068f1ac1fbd49eded0d0f43d6b392508d
Add support for vtkTable to vtkExtractSelectedThresholds.

vtkExtractSelectedThresholds didn't handle vtkTable. Fixed that.

Change-Id: Icf7092cb56b1c47d0f15d8c28924e57129a6f21f
Merge topic 'streaming-multiblock-genericio-reader' into master

b2bd40ab Block opacity and color are now more independent
2f43b031 Add block amount of detail information key
Merge topic 'fix_extract_thresholds_for_table' into master

1c9adc2e Add support for vtkTable to vtkExtractSelectedThresholds.
Fix compiler error

No clue how that got through.

Change-Id: Ib0a6ed7eca4dd5f58edbb31e3a190d242e2fdc93
Merge topic 'wtf' into master

4b6c88a3 Fix compiler error
Merge remote-tracking branch 'origin/master' into opengl2_volumerendering

Change-Id: I03b6e2c3ac544593c68f419859375bcd4ef7589b