Hub integration. RForum Users are lazy-created when Hub users, logged in,
visit RForum for the first time. RForum navigation links to log in and
out or change settings all point at Hub. Webmaster and adminstrator roles
in Hub map to administrator permissions in RForum; in addition to the
RForum permission management system, though, added Hub permissions hashes
to various controllers to include Hub authorisation too. Two layers can't
hurt and it means sensible return-to'd redirections to Hub for some
action types.

Corrected grammar on deletion confirmation messages and tidied up a few
templates here and there, too.