Prevent execution of ticket searches in the database if a timestamp is invalid.
This fixes bug #9512.
Fixed bug#4465 - Spell checker ispell ignores some characters such German umlauts.
Fixed bug#9589 - AgentLinkObject does not show TreeView option for linkable ITSMConfigurationManagement objects.
Fixed small typo.
Fixed incorrect log object call for 310ae92800c8f6d7266defe8da0ba0d8fa2d4fc5 (for bug #9512).
Fixed typo.
Merge branch 'master' of git.otrs.com:otrs/otrs
Improved regexes. Tidied code.
Removed comment test.
Fixed/improved email address check for ticket bounce and merge.
This fixes bug #3007.
Fixed unit test for 310ae92800c8f6d7266defe8da0ba0d8fa2d4fc5.
Fixed small typo in perldoc.
Merge branch 'master' of https://github.com/OTRS/otrs into HEAD