Fixed: Custom State types not working with "otrs.PendingJobs.pl" any more (bug#10365).
Fixed: System Email notification external not highlighted correctly (bug#10349).
Fixed: Statistics per agent also shows invalid agents (bug#10277).

Squashed commit of the following:

commit 468fa5d3ea6d191c0f197beea6aa38a2559dfef1
Author: s7design <otrs@s7designcreative.com>
Date:   Fri Mar 7 14:44:43 2014 +0100

    Added the same fix like in Ticket.pm  for  all statistics

commit 8032c58cdca79d708b0886851a5a320d0767d61d
Author: s7design <otrs@s7designcreative.com>
Date:   Thu Mar 6 00:49:08 2014 +0100

    Added config parameter for invalid Agent in stats, and added check for this parameter.
    If parameter is set and have value  "No" in stats is shown only valid Agent.

commit cda93bfd51d86e6718bca722efcebb836816d81c
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Mar 4 16:23:17 2014 +0100

    [Bug 10277] Statistics per agent also shows invalid agents

    Cahnged UserList forselection  boxes in Stats module. It are shown only valid Agents.
Fixed: Dynamic Field: Multi Select does not allow empty values (bug#10318).
Make test more robust to not fail if Fred ist installed.
Added test case.
Fixed bug#4224 - Unused variable , thanks to Bernhard Schmalhofer.
Fixed: SMIME signing fail on mails with attachements (bug#10251).
Fixed: Inline images displayed as attachment in SMIME and PGP signed messages (bug#10364).
Merge remote-tracking branch 'upstream/master'