Fixed: When a ticket is deleted by generic agent job,  No such TicketID error (bug#9600).
Squashed commit of the following:

commit a2aa4c8422f94c917696674e8311e54898ce3514
Author: s7design <otrs@s7designcreative.com>
Date:   Wed Feb 26 01:50:14 2014 +0100

    Added next if !%Ticket for fixing message Need TicketID!  in Sys Log

commit 175c2d197d2578573921adc669b4adb4c319acb8
Author: s7design <otrs@s7designcreative.com>
Date:   Wed Feb 26 00:07:59 2014 +0100

    [Bug 9600] When a ticket is deleted by generic agent job, No such TicketID error

    Set Silent => 1 parameter in TicketGet function, that avoids the error message.

Conflicts:
	CHANGES.md
Fixed: Applying Filters to tickets in Status View or Queue View will log out session. (bug#10321).

Conflicts:
	Kernel/Output/HTML/Standard/AgentTicketOverviewSmall.dtl
Fixed: "Ouf of Office" shows inactive agents (bug#10299).
Squashed commit of the following:

commit fb1cfbc62337a37260f20baa1be95656e2c3ebb7
Author: s7design <otrs@s7designcreative.com>
Date:   Fri Feb 28 15:26:05 2014 +0100

    Changed: it work for invalid and invalid-temporarily.  Only valid user is showed in wiget

commit b3606b35ca774577799ecb83dfa16670561c8b77
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Feb 25 21:49:28 2014 +0100

    Added USERID label in next, because I made mistake in previous commit

commit 876c4ce16cb8559ceb3155c6b1486c7cefdb7596
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Feb 25 21:44:22 2014 +0100

    [Bug 10299] "Ouf of Office" shows inactive agents

    Added check if user is valid in wiget Out of office
Added fred Css for customer frontend.
Tidied.
Fixed UTs on Perl 5.18.
Added FontAwesome also to Login.tt to make sure all icons are displayed correctly also on the login screen (if any).
Fixed: Restricting process list by ACLs is only working with UserID (bug#10240).
Added a new central ObjectManager to simplify singleton object creation and usage. Thanks a lot to Moritz Lenz @ noris network.
Merge remote-tracking branch 'upstream/master'