allow to use external accoutns when mail module unconfigured
remove dead code
fixed check repeated mail addresses
fioxed regression in adding group aliases
up chlog
added div to mail account set in form
typo fix
Merge branch 'master' into mail-accounts-fixes

Conflicts:
	main/mail/ChangeLog
	main/samba/ChangeLog
	main/samba/src/EBox/Samba/CGI/EditGroup.pm
Merge pull request #1465 from Zentyal/jag/mail-accounts-fixes

Fixed group mail alias creation, Fixed problems with checking mail address duplicates,