Add Hook doPreMassActions

Add Hook doPreMassActions to allow dedicated form display for custom mass actions

htdocs/core/tpl/massactions_pre.tpl.php

@@ -166,3 +166,13 @@
 
 	dol_fiche_end();
 }
+// Allow Pre-Mass-Action hook (eg for confirmation dialog)
+$parameters['toselect']=$toselect;
+$parameters['uploaddir']=$uploaddir;
+
+$reshook=$hookmanager->executeHooks('doPreMassActions',$parameters, $object, $action);
+if ($reshook < 0) {
+    setEventMessages($hookmanager->error, $hookmanager->errors, 'errors');
+} else {
+    print $hookmanager->resPrint;
+}