Re #6829. Added a verbose flag to get_custom_wiki_section.
Re #6829. Added several sections to offline help for algorithms.

Specifically usage, description and a list of categories.
Re #6829. Rolled my own html writing class.
Re #6829. Copied functionality from wiki_tools and remove dead code.
Re #6829. Fixing wiki formatting mistake.
Re #6829. Fixed goofy tab label and sorted algorithms.
Re #6829. First pass at mediawiki parsing.
Re #6829. Added bits to parse the summary statement as mediawiki.
Re #6829. Adding ability to specify url to HelpWindow constructor.
Merge remote-tracking branch 'origin/feature/6829_qtassistant_algorithms'