Fixed groupBy with spaces in field declaration (#683)

* Fixed groupBy with saces in field declaration

Sometimes you have to use GROUP BY in SQL with Spaces in it. The old implementation deleted all spaces in $groupByField
Eg "IF(qv.idValue IS NULL, UUID(), qv.idValue)" would become "IF(qv.idValueISNULL,UUID(),qv.idValue)"

* Addes operators <>=! to groupBy

MysqliDb.php

@@ -1194,7 +1194,7 @@ class MysqliDb
      */
     public function groupBy($groupByField)
     {
-        $groupByField = preg_replace("/[^-a-z0-9\.\(\),_\*]+/i", '', $groupByField);
+        $groupByField = preg_replace("/[^-a-z0-9\.\(\),_\* <>=!]+/i", '', $groupByField);
 
         $this->_groupBy[] = $groupByField;
         return $this;