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