MDL-14493 First checkin of Feedback module into HEAD.

I made a number of small tidy-ups to the contrib version before adding this here:

  - fixed some language string names
  - renamed a capability from deletecompleteds to deletesubmissions (can we use "submissions" everywhere?)
  - got rid of language packs (moved english to correct location)
  - deleted 'pics' type (it needs to be rewritten to use user files in moodledata)
  - moved changelog into README.txt
  - moved captcha font out of subdir
  - bumped version to today

Thanks very much to Andreas Grabs for all your work on this module so far, and congratulations!   :-)

mod/feedback/unmapcourse.php

@@ -0,0 +1,46 @@
+<?php // $Id$
+/**
+* drops records from feedback_sitecourse_map
+*
+* @version $Id$
+* @author Andreas Grabs
+* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
+* @package feedback
+*/
+
+    require_once("../../config.php");
+    require_once($CFG->dirroot.'/mod/feedback/lib.php');
+
+    $id = required_param('id', PARAM_INT);
+    $cmapid = required_param('cmapid', PARAM_INT);
+    
+    if ($id) {
+        if (! $cm = get_coursemodule_from_id('feedback', $id)) {
+            error("Course Module ID was incorrect");
+        }
+
+        if (! $course = get_record("course", "id", $cm->course)) {
+            error("Course is misconfigured");
+        }
+        
+        if (! $feedback = get_record("feedback", "id", $cm->instance)) {
+            error("Course module is incorrect");
+        }
+    }
+    $capabilities = feedback_load_capabilities($cm->id);
+    
+    if (!$capabilities->mapcourse) {
+        error ('access not allowed');
+    }
+
+
+    // cleanup all lost entries after deleting courses or feedbacks
+    feedback_clean_up_sitecourse_map();
+
+    if (delete_records('feedback_sitecourse_map', 'id', $cmapid)) {
+        redirect (htmlspecialchars('mapcourse.php?id='.$id));
+    } else {
+        error('Database problem, unable to unmap');
+    }
+
+?>