STYLE: Convert tabs to spaces

Change-Id: I3aa5bc318fc98879e24da603aa3175ac07d43057
Merge topic 'ConvertTabsToSpaces'

14eaf59 STYLE: Convert tabs to spaces
Merge topic 'CMakeListsStyle'

ad20dbe STYLE: CMake style fixes
ENH: Cleanup ObjectDocuments classes and add basic tests

Change-Id: Ia5a27b73f37d9f52e215ef784bb21373029034d5