Merge remote-tracking branch 'upstream/master'
Restore redirect functionality removed by change 452ff19d
Imported mails were deleted the second time the poller ran - when moving or deleting of mails was activated.
prevent infinite redirect on network page for non-existant group
Merge pull request #650 from fermionic/20130316-network-infinite-redirect

prevent infinite redirect on network page for non-existant group
double encode any text that is destined for meta fields.
Merge https://github.com/friendica/friendica into pull
don't allow deleted accounts to appear on "manage" page
Merge pull request #649 from mexon/redirect_fix

Restore redirect functionality removed by change 452ff19d
use _Enable Debugging_ instead of only _Debugging_ in the interface
rm addon.old
Merge https://github.com/friendica/friendica into pull
Convert received "edited" timestamp to UTC before comparing to what's in the database, and don't overwrite with older items.
Merge pull request #651 from tobiasd/admin_logs_wording

Admin logging UI string clarification
Use filter_var instead of parse_url to validate URLs, since the latter returns true even for invalid URLs, in particular the empty string
DE: update to the strings
PL: update to the strings
RU: update to the strings
RU: update to the strings
PL: update to the strings