Improved search screen handling of default values with a preset value.
Make db upgrade script a bit more robust.
Moved UT.
Fixed bug#[10041](http://bugs.otrs.org/show_bug.cgi?id=10041) - Queue Based Calendars not shown only the standard calendar is used.
Datepicker is now using SLA/queue calendar if shown in connection with existing tickets.
Fixed bug#[5252](http://bugs.otrs.org/show_bug.cgi?id=5252) - For pending- and escalation-notification only the standard calendar is used.
Sending of pending reminders, unlocking of overtime tickets and sending of generic agent escalation notifications will now respect SLA/queue calendar.
Improved handling of database connection problem.
Show an error screen instead of rasising an internal server error.
Avoid unneccessary var/tmp folder creation.
Fixed translation function for zero numbers.
Improved unit test.
Fixed wording in the system registration log message.
Added waring to POD.
Added code to prevent execute InMemory cache within the scheduler.
Improved IndexAccelerator SQL to use proper JOINs, thanks to Moritz Lenz.
Fixed uninitialized value problem in Package.pm.
Merge remote-tracking branch 'upstream/master'