Update HTML processing code to handle Component wiki pages

The Bugzilla Components have been split up into separate wiki pages
under QA/Bugzilla/Components/<component name>. This commit
re-assembles the appropriate pieces into one xhtml document so that
the BSA can use the content.

New text file components.txt includes all FDO components except for
'deletionrequest', which fails one of the tests in sanity.pl.

The url for the "long" help pages has been changed to
$WIKI$/QA/Bugzilla/Components/<component name>/Extended_Help