Added a check to see if Dif'ed were installed per OPM.
Revert "Fixed bug#4512 - HTMLUtils ToAscii forces line breake on fixed line-length 78."

This reverts commit d0e4e6ea2c2ac5bfc3608cc01032c9684a419181.

Conflicts:
	CHANGES.md
Updated jsPlumb to version 1.5.5.
Updated Russian translation, thanks to Andrey N. Burdin.
Updated Swedish translation, thanks to Andreas Berger.
Fixed bug#10075 - Stats widgets permission group is hardcoded to 'stats'.

Conflicts:
	CHANGES.md
Fixed wrong group names.
Merge branch 'feature-checksumImpovement-shb-master' of https://github.com/dignin/otrs into rel-3_3
Tidied.
Fixed bug#10077 - regular expressions in postmaster filter return 1 if no regex match.
Fixed CHANGES.
Fixed: Installer fails when special characters in database user's password (bug#10056).
Extended fix for bug#9928 - Dropdown field in tree mode are not displayed in tree mode in column filters.
Fixed: Installer: error log after creating mysql database (bug#10078).
Updated Swedish translation, thanks to Andreas Berger.
Fixed: Wrong article type with external ticketnumber recognition i.c.w. follow-up reject option (bug#9702).
Fixed bug#9723 - TicketAccountedTime stat does not run on Oracle with many tickets.
Added functionality to disable access to tickets of other customers with the same customer company in customer interface (#1365).
Fixed bug#9650 - Special character in customer id breaks Open Tickets in AgentTicketZoom.
Fixed lost QueryCondition UnitTest of rel-3_2.