[FIX] areas: Empty areas list before updating areas so deleted categories/perspectives get removed from the list plus a few cosmetic fixes.
Thanks marclaporte, hopefully addresses wish4826

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48194 b456876b-0849-0410-b77d-98878d47e9d5