Timeouts for email domain DNS check

It is no fun to wait more than 10 seconds for AgentTicketEmail or so
in the web interface
Fixed: Owner and Responsible are mandatory if enabled (bug#10058).
Fixed: Wrong error message if Transition contains no transition actions (bug#10070).
Revert "Fixed bug#4512 - HTMLUtils ToAscii forces line breake on fixed line-length 78."

This reverts commit b5a4ade38efb356f5c91f1c14ffd11a9444b0dfd.

Conflicts:
	CHANGES.md
Removed duplicate line.
Merge branch 'master' of git.otrs.com:otrs/otrs
Updated jsPlumb to version 1.5.5.
Updated Russian translation, thanks to Andrey N. Burdin.
Fixed bug#10075 - Stats widgets permission group is hardcoded to 'stats'.
Updated Swedish translation, thanks to Andreas Berger.

Conflicts:
	Kernel/Language/sv.pm
Fixed wrong group names.
Revert "Fixed bug#4663 - browsing article tree by 'next / down' and 'previous / up' buttons."

This reverts commit 3e7d09ce574751490961d4b67cf25cc16b584576.

Conflicts:
	CHANGES.md
Merge branch 'dns-timeout' of https://github.com/moritz/otrs
Added a check to see if Dif'ed were installed per OPM.
Tidied.
Fixed bug#10077 - regular expressions in postmaster filter return 1 if no regex match.
Fixed: Installer fails when special characters in database user's password (bug#10056).
Fixed: Installer: error log after creating mysql database (bug#10078).