Fixed: Added old ticket information to ticket_history (bug#10027).
Fixed: Subject always cleaned from prefixes, irrespective of configuration (bug#10023).

Conflicts:
	CHANGES.md
Fixed bug#10020 - Event Information within Events Ticket Calender has wrong translation.

Conflicts:
	CHANGES.md
Fixed: Timestamps in HistoricalValueGet return milliseconds on SQL Server (bug#9999).
Fixed tests.
Fixed bug#10028 - Duplicate Access Keys/hardcoded assignments.
Simplify TicketAcl code a bit

no functional changes, just some simplifications (and avoidance of
hash copying) found while reading through the TicketACL code.
Added test case for bug#9989. This might start failing on some systems.
Merge branch 'simplify-ticket-acl' of https://github.com/moritz/otrs
Fixed: After empty ticket list, Column Filters are reset in Overview Small screens (bug#9997).
Fixed: Reset filters in small overviews does not reset the ticket list (bug#10036).
Merge remote-tracking branch 'upstream/master' into otrs-master