Added and used checkMailNotInUse method
fixed changelog
removed extra blank lines
check mail also in edit user form
undo bad typos
check also couriermailias to see if a address is not in use
better error for checkMailNotInUse
better mail in use error message for alias
remove mailbox-related objectclass and its uses
added documentation for checkMailNotInUse
Add debug trace
Return empty string instead of undef is displayName not set
Add script to update the credentials when mode is external AD
Set +x mode on script
Merge branch 'master' into groups-check-mail

Conflicts:
	main/mail/src/EBox/Mail.pm
	main/mail/src/EBox/MailAliasLdap.pm
	main/users/ChangeLog
	main/users/src/EBox/Users.pm
removed extra blank lines
Removed obsolete dns-$hostname account from OpenLDAP, it should be only available in Samba
Ignored and logged as errors the users, contacts and groups in OpenLDAP that are not linked with Samba objects
Removed obsolete dns-$hostname account from OpenLDAP, it should be only available in Samba

Conflicts:
	main/samba/src/EBox/Samba.pm
Ignored and logged as errors the users, contacts and groups in OpenLDAP that are not linked with Samba objects

Conflicts:
	main/samba/src/scripts/s4sync