dont try to add two times the same mail when creating a group alias
fixed changelog

Conflicts:
	main/mail/ChangeLog
Added and used checkMailNotInUse method

Conflicts:
	main/mail/ChangeLog
	main/users/ChangeLog
removed extra blank lines
check mail also in edit user form

Conflicts:
	main/users/src/EBox/Users/LdapObject.pm
undo bad typos
check also couriermailias to see if a address is not in use
better error for checkMailNotInUse
added missing  printableType methods
better mail in use error message for alias
added documentation for checkMailNotInUse

Conflicts:
	main/mail/src/EBox/Mail.pm
releasing users 3.2.9
Merge branch 'jag/3.2-mailboxrelated-fixes' into 3.2

Conflicts:
	main/mail/ChangeLog
	main/users/ChangeLog