Custom Usage Wikisection

[OwenArnold]

This ticket is blocked by :

• TRAC6147

This ticket is blocks : TRAC6690

Change the wikimaker to handle two types of custom usage section '''WIKI_USAGE''' and '''WIKI_USAGE_NO_SIGNATURE'''

The first option will append a wiki usage below the auto-generated usage section on the wiki page. The second option will replace the wiki usage section with the custom section. Either of these two options are only extracted from the source code *.cpp and *.py files.

Also under this ticket, existing algorithms (with a custom usage section) will be updated to use these tags.

[OwenArnold]

This issue was originally trac ticket 6709