Added Python helper class for testing alg deprecation. Refs #6677
Fix bug in IAlgorithm::categories export. Refs #6677
Add type to Property python export. Refs #6677
Standardize python property vs function on Property class. Refs #6677

Now behaves more consistently and like the original.
wiki_maker can now work with a debug build of Mantid on Windows

Any calls to mantid are done via a subprocess but only when running in
debug so as not to compromise the speed of using it in release. Refs #6677
Allow for property & function isValid types. Refs #6677
Merge remote-tracking branch 'origin/master' into feature/6677_wikimaker_win_debug. Refs #6677

Wouldn't usually merge from master but these conflicts were quite involved
to solve.

Conflicts:
	Code/Mantid/Build/wiki_maker.py
	Code/Mantid/Framework/PythonInterface/mantid/simpleapi.py
Fixes for errors after conflict resolution. Refs #6677
Merge branch 'feature/6677_wikimaker_win_debug' into develop. Refs #6677

Conflicts:
	Code/Mantid/Build/wiki_maker.py