ENH: Script to generate API differences between two git revisions

The script uses git and ctags to generate a list of classes and public
methods added/removed.
It also lists newly deprecated methods.
The flag --wikiOutput can be used to print the report with wiki markup.

Change-Id: I12a9df100099527599aa5762540e01bd09460c0b
Fixed minor bug in the ensight gold reader.

Was not skipping bar3 elements properly. Also removed
warnings that were no longer necessary. This reader now
supports higher order elements.

Change-Id: I9f89100d2a67fb704cdc59900d2fce16e7349c0f
Added EnSight tests to increase coverage.

Also added associated data.

Change-Id: I29de59dabf130855aff68c73ff50bf6f35048b56
Merge topic 'ensightgold-bugfix' into master

6066b788 Fixed minor bug in the ensight gold reader.
Merge topic 'added-ensight-tests' into master

37dc617d Added EnSight tests to increase coverage.
Merge topic 'semantic_diff_ctags' into master

bfed0a05 ENH: Script to generate API differences between two git revisions