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.php

@@ -86,7 +86,10 @@ class IDF_Views
         $title = __('Create Your Account');
         $params = array('request'=>$request);
         if ($request->method == 'POST') {
-            $form = new IDF_Form_Register($request->POST, $params);
+            $form = new IDF_Form_Register(array_merge(
+            									(array)$request->POST, 
+												(array)$request->FILES
+												), $params);
             if ($form->isValid()) {
                 $user = $form->save(); // It is sending the confirmation email
                 $url = Pluf_HTTP_URL_urlForView('IDF_Views::registerInputKey');