bug #9754: rendering of articles with many links

This is only a partial fix; it speeds up the case where many identical links
are present within the same email.

It speeds up the case mentioned at http://bugs.otrs.org/show_bug.cgi?id=9754
from 17.48 ± 0.23 s to 1.76 ± 0.06 s.
Fixed bug#9751 - TimeUnits are not accepted with a value of 0.
Updated changes file.
Fixed bug#9435 Ticket not created if first dialog has CustomerID configured as 'do not show'.
Fixed bug#9688 - ORA-01839 error occurs at DynamicField in TicketSearch.
Fixed bug#9688 - ORA-01839 error occurs at DynamicField in TicketSearch.
Added filter exceptions.
Set explicit MIME type for woff fonts.

The mime type for these fonts has been relatively recently registered
at IANA (2013 Q1) and Apache might not provide the correct MIME type
without it.

This also prevents warnings like this from Chrome Developer Tools:
"Resource interpreted as Font but transferred with MIME type application/x-font-woff"
Fixed bug#9747 - Only first selected process displays the RichText editor.
Added note about bugfix.
Fixed bug#9748 - ProcessManagement: Duplicate articles in a process-ticket (TransitionAction).
Fixed bug#9580 - Time fields in TicketGetResponse Ticket element do not comply with xsd:DateTime format.
Fixed typos.
Added hover color to close button for consistency and user feedback.
Merge branch 'bug-9754' of https://github.com/moritz/otrs
Loose URL in HTML printout.

PDF prints lost their URLs in 818f62cbe2d7081ec920d9631f11ff05bededb61
however HTML prints still had them.
Make time test more stable.
Follow-up fix for #9747 - also work correctly when no process is selected after one was selected.
Fixed bug#9762 - Queue View - S / M / L views - not saved after logout.
Fixed bug#9764 - ACL, Queue will ignored with customerID.