Merge topic '13082_fix_log_lut' into pv-master

2d67f63 Opacity function doesn't support log mapping.
723a469 Merge remote-tracking branch 'pvvtk/pv-master' into HEAD
5582d50 Merge topic '14189_set_annotations_deep_copy' into master
be5771a Merge topic '13082_fix_log_lut' into master
06ef3b9 Change `vtkScalarsToColors::SetAnnotations` behavior.
1654337 Cleanup logic for indexed colors.
37a10c6 Release graphics resources properly.
1509669 Cleaning up transfer function widgets.
1fb3bd9 Merge topic 'fix_warning' into master
080a7f7 resolve new warning
f02476b Merge topic 'more_than_32_categories' into master
2c86574 use SetMaxDiscreteValues for categorical color map
02ffb7a change MAX_DISCRETE_VALUES into an ivar
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: I6eced0a34404ac64b39c5b67c13644d79d122f6b