Fixed problems various tabs now showing in "Settings" and other fixes.

Fixed problems various tabs now showing in "Settings" and other fixes.

Added filters to commonHooks to say whether members and/or counties are enabled.
Applied those filters in the admin/settings/header.html file instead of view parameters.
Removed code that added $enable_members and $enable_counties view parameters from a number of files.
Added info on new hooks to hooksHelp.html