Implemented an extended user profile based on a patch from Jethro Carr (issue 510).

Changes with respect to the original patch:
- use Gconf instead of separate table / data scheme
- better form validation for URLs and emails
- no htmlentity-encoded contents in the database (pluf automatically safe-encodes
  stuff before it writes out contents into templates)
- add visual separators in the form views to have a distinct view of basic
  (important) data and other data which are only displayed in the public profile
- give a hint about the maximum display size of 60x60 px^2 and use max-width and
  max-height in the templates to avoid nasty distortions by the browser
- use target=_blank and rel=nofollow on the twitter and website links in the profile
- some whitespace / formatting / code style fixes

src/IDF/Views/Admin.php

@@ -268,7 +268,9 @@ class IDF_Views_Admin
         }
 
         if ($request->method == 'POST') {
-            $form = new IDF_Form_Admin_UserUpdate($request->POST, $params);
+            $form = new IDF_Form_Admin_UserUpdate(array_merge($request->POST,
+                                                              $request->FILES),
+                                                  $params);
             if ($form->isValid()) {
                 $form->save();
                 $request->user->setMessage(__('The user has been updated.'));
@@ -299,7 +301,9 @@ class IDF_Views_Admin
                         'request' => $request,
                         );
         if ($request->method == 'POST') {
-            $form = new IDF_Form_Admin_UserCreate($request->POST, $params);
+            $form = new IDF_Form_Admin_UserCreate(array_merge($request->POST,
+                                                              $request->FILES),
+                                                  $params);
             if ($form->isValid()) {
                 $cuser = $form->save();
                 $request->user->setMessage(sprintf(__('The user %s has been created.'), (string) $cuser));