Added 'Bulk edit' functionality.

This can be done by clicking on the edit link (little pen icon) at the upper-left corner of the issue list.
Most properties can be set (priority, assignee, category, fixed version, start and due dates, done ratio) and a note can be entered.
Only issues of the current project can be selected for bulk edit (subproject issues can't).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@817 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/javascripts/application.js

@@ -49,6 +49,16 @@ function promptToRemote(text, param, url) {
     }
 }
 
+/* checks that at least one checkbox is checked (used when submitting bulk edit form) */
+function checkBulkEdit(form) {
+	for (var i = 0; i < form.elements.length; i++) {
+        if (form.elements[i].checked) {
+            return true;
+        }
+    }
+    return false;
+}
+
 /* shows and hides ajax indicator */
 Ajax.Responders.register({
     onCreate: function(){