[#6845] Handle issue X and rX references in GC tracker importer

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#6845] Preserve inter-project links when importing from GC

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#6845] Preserve links in GC ticket import and fixed Index error on non-GC links

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#6866] [#6479] proper social network URL check; allow clearing out FB url
[#6852] ticket:476 added maximize button for tracker pages
[#6852] ticket:476 changed style of actions block to trim text
[#6826] ticket:484 Mass edit emails

Reply-to field has updated to use config['forgemail.return_path']