forward to all if no group archive requested
Merge pull request #6151 from jdalsem/patch-9

Forward to list of all group blogs if archive not requested
fixed a unittest I broke in #398
changed the bugtracker url from the developers plugin to GitHub
Merge pull request #6170 from jeabakker/removed-link-to-trac

Removed Trac from developers plugin manifest
replaced all references to trac.elgg.org to the correct GitHub issues
found some more references to trac
Merge pull request #6174 from jeabakker/6172-replace-references-to-trac-elgg-org

replace all references to trac.elgg.org to the correct GitHub URLs
Merge pull request #6155 from jeabakker/fix-broken-unittest-from-398

fixed a unittest I broke in #398