themes: MDL-19077 new $OUTPUT->header/footer to replace print_header/footer.

Also, part of the change from weblib.php functions to $OUTPUT-> methods.

This is part of http://docs.moodle.org/en/Development:Theme_engines_for_Moodle%3F

This is a big change, and the result is not perfect yet. Expect some debugging output
on some pages.

The main part of these changes are that $OUTPUT->header now looks for a file
in the theme called layout.php, rather than header.html and footer.html. Also
you can have special templates for certain pages like layout-home.php. There is
fallback code for Moodle 1.9 themes, so they still work.

A few of the old arguments to print_header are no longer supported. (You get an
exception if you try to use them.) Sam H will be cleaning those up.

All the weblib functions that have been replaced with $OUTPUT-> have version in
deprecatedlib, so existing code will go on working for the foreseeable future.

question/question.php

@@ -241,7 +241,6 @@ if ($mform->is_cancelled()){
 } else {
 
     $streditingquestion = $QTYPES[$question->qtype]->get_heading();
-    $headtags = get_editing_head_contributions($question);
     if ($cm !== null) {
         $strmodule = get_string('modulename', $cm->modname);
         $strupdatemodule = has_capability('moodle/course:manageactivities', get_context_instance(CONTEXT_COURSE, $COURSE->id))
@@ -259,7 +258,7 @@ if ($mform->is_cancelled()){
         }
         $navlinks[] = array('name' => $streditingquestion, 'link' => '', 'type' => 'title');
         $navigation = build_navigation($navlinks);
-        print_header_simple($streditingquestion, '', $navigation, '', $headtags, true, $strupdatemodule);
+        print_header_simple($streditingquestion, '', $navigation, '', '', true, $strupdatemodule);
 
     } else {
         $navlinks = array();
@@ -268,7 +267,7 @@ if ($mform->is_cancelled()){
         $strediting = '<a href="edit.php?courseid='.$COURSE->id.'">'.
                 get_string("editquestions", "quiz").'</a> -> '.$streditingquestion;
         $navigation = build_navigation($navlinks);
-        print_header_simple($streditingquestion, '', $navigation, '', $headtags);
+        print_header_simple($streditingquestion, '', $navigation, '', '');
     }
 
     // Display a heading, question editing form and possibly some extra content needed for