Fixed: Safer commands to upgrade OTRS using PostgreSQL (bug#10449).

Conflicts:
	UPGRADING.md
Fixed: rfc822 attachments name creating bug and validation enhancement (bug#10394).
Fixed: E-mail header parsing bug (bug#10395).
Typo fix

was: Repy, is: Reply
Merge remote-tracking branch 'upstream/master' into otrs-master