Function churchcore_getCompleteUserByCMSId
TODO: sql is the only difference to churchcore_getUserByCMSId, use one for both? not used anywhere!
Parameters summary
| string | $CMSID | |
| boolean | $multiple = false | $multiple; if false return first user, else return comma separated list | 
Return value summary
| 
				one
			 | or more ids, null if none found |