Add callback before edit form (bug #759)

adminer/include/adminer.inc.php

@@ -480,7 +480,7 @@ class Adminer {
 		echo "</script>\n";
 		echo "</div></fieldset>\n";
 	}
-
+	
 	/** Print command box in select
 	* @return bool whether to print default commands
 	*/
@@ -659,6 +659,16 @@ class Adminer {
 		;
 	}
 
+	/** Print before edit form
+	* @param string
+	* @param array
+	* @param mixed
+	* @param bool
+	* @return null
+	*/
+	function editRowPrint($table, $fields, $row, $update) {
+	}
+
 	/** Functions displayed in edit form
 	* @param array single field from fields()
 	* @return array