re #15289

The converted text is stored in separate .rst files in the docs directory.
Refs #9562

and added unit test to test ok

re #6485

Touches nearly everything unfortunately but is necessary.

Refs #3984 Took the wiki description from every algorithm's wiki page and placed it in a comment in the CPP file (instead of the header file).

Refs #3934: Refactored units to use an initialize() method and a singleToTOF() method. This was used in EventList's to directly convert TOF's without having to go through getTofs() setTofs(). This also preserves sort order.

Add a copy constructor to Instrument. Oh, and go on a const-correctness hunt that led this commit to touch slightly more than just the one class. Re #1944.

Refs #262: Created a more generic CompositeValidator and renamed the old CompositeValidator to CompositeWorkspaceValidator. Added some methods to IValidator for future enabled/visible choice.