Merge branch 'master' of https://github.com/OTRS/otrs
Upgrading DB diagram.
Fixed margins for form screens without a sidebar.
Visual improvements.
Improved caching to also cover thirdparty css and js files.
Updated exceptions for OTRSCodePolicy
Fixed bug#9728 - Bulk action (send email) ignores reply-to address from unknown customers.
Fixed bug#9728 - Bulk action (send email) ignores reply-to address from unknown customers.
Improved fix for bug#9728.
Added sort arrows for more tables.
Added sort arrows for more tables.
Ported stat to use TimeObject and Time::Piece.

So we can get rid of Date;:Pcalc of which the new version on CPAN has
different dependencies, and the old version (only available on BackPAN)
is from 2002.

Time::Piece is a core module since perl 5.10 which just happens to be
the minimum version for OTRS 3.3.
Added policy exception.
Create correct session IDs, added test for GetAllSessionIDs.
Fixed otrs.DeleteCache.pl returns error state if cache was empty.
This fixed bug#9726.
Visual improvement of settings widget on the dashboard.
Added Marc's new Email button to Bounce and Compose

Also the exclamation mark was removed; the button no longer
reads 'Send Email!' but it is now 'Send Email'.
Removed non-used module Date::Pcalc
Fixed uninitialized value warning when creating agents.
Use TimeObject instead of Date::Pcalc for backup.pl

Also made script work for PostgreSQL databases with passwords.