Resolve WB-472 Improve Help Searching: Search command limited listed hep pages...

Resolve WB-472 Improve Help Searching: Search command limited listed hep pages to those containing the search query.  However, if a parent item did not contain the search text, its childen were not displayed even if one of the children contained the search text.  There are now two sections on the Help Dialog: Table of Contents that contains the help hierarchy and Search that contains all commands in alphabetical order with a search text box.