(Bug 4832) Rename old-style request objects to $apache_r

For greater clarity, and to make it easy to hunt them down later.

Also removes in a couple places where they were initialized but not
used.
(Bug 4832) Fix status code
Bug 4657 - comment edited notification does not appear under Entries & Comments filter
http://bugs.dwscoalition.org/show_bug.cgi?id=4657
-- Add edit comment notif to comments filter in inbox
Bug 4777 - Abstractia: header_background not actually implemented
http://bugs.dwscoalition.org/show_bug.cgi?id=4777
(Bug 4831) Remove one of the two colons after Diagnostics.
(Bug 4783) Skip paid expiration warnings for deleted users.
Bug 4835 - Librarian's Dream: wrong URLS for backgrounds
http://bugs.dwscoalition.org/show_bug.cgi?id=4835
-- Update image URLs
-- Move common image to /commons
Bug 4836 - Librarian's Dream: header_background_image doesn't work
http://bugs.dwscoalition.org/show_bug.cgi?id=4836
-- Remove CSS overrides
Bug 4838 - Librarian's Dream: links aren't in the correct order/use different selectors
http://bugs.dwscoalition.org/show_bug.cgi?id=4838
-- Reorder links
-- Use same selectors for links
Bug 4785 - Background images not showing in Librarian's Dream
http://bugs.dwscoalition.org/show_bug.cgi?id=4785
-- Remove CSS override
Merge pull request #211 from afuna/apache-request-status-bug4832

(Bug 4832) Define status code, use $apache_r
Merge pull request #212 from ninetyd/bug4657/inboxfilter_edits

Bug 4657 - comment edited notification does not appear under Entries & C...
Merge pull request #215 from ninetyd/bug4777/abstractia_headeroption

Bug 4777 - Abstractia: header_background not actually implemented
Merge pull request #216 from alierak/support-diags-bug4831

(Bug 4831) Remove one of the two colons after Diagnostics.
Merge pull request #217 from alierak/paidstatus-bug4783

(Bug 4783) Skip paid expiration warnings for deleted users.
Merge pull request #218 from ninetyd/bug4835/librarian_urls

Bug 4835 - Librarian's Dream: wrong URLS for backgrounds
Merge pull request #219 from ninetyd/bug4836/librarian_headerimage

Bug 4836 - Librarian's Dream: header_background_image doesn't work
Merge pull request #221 from ninetyd/bug4838/librarian_linkorder

Bug 4838 - Librarian's Dream: links aren't in the correct order/use diff...
Merge pull request #222 from ninetyd/bug4785/librarian_pagebkg

Bug 4785 - Background images not showing in Librarian's Dream