MDL-36017 Fields numsections, hiddensections and coursedisplay are now format-specific options

- Fields added to format_legacy as default course format options;
- Upgrade script copies fields values from table course to course_format_options;
- Fields removed from table course;
- Fields removed from edit course form;
- Since front-page course has a 'numsections' setting, format_site defines it as it's option;
- Removed accessing those fields in core code unless we know that format supports them and in this
  case instead of $course = $DB->get_record('course'); we use:
  $course = course_get_format($courseorid)->get_course(); This way all format-specific options
  are added to the $course object

course/format/formatlegacy.php

@@ -98,8 +98,46 @@ class format_legacy extends format_base {
             }
         }
 
-        // else, default behavior:
-        return parent::get_view_url($section, $options);
+        // if function is not defined
+        if (!$this->uses_sections() ||
+                !array_key_exists('coursedisplay', $this->course_format_options())) {
+            // default behaviour
+            return parent::get_view_url($section, $options);
+        }
+
+        $course = $this->get_course();
+        $url = new moodle_url('/course/view.php', array('id' => $course->id));
+
+        $sr = null;
+        if (array_key_exists('sr', $options)) {
+            $sr = $options['sr'];
+        }
+        if (is_object($section)) {
+            $sectionno = $section->section;
+        } else {
+            $sectionno = $section;
+        }
+        if ($sectionno !== null) {
+            if ($sr !== null) {
+                if ($sr) {
+                    $usercoursedisplay = COURSE_DISPLAY_MULTIPAGE;
+                    $sectionno = $sr;
+                } else {
+                    $usercoursedisplay = COURSE_DISPLAY_SINGLEPAGE;
+                }
+            } else {
+                $usercoursedisplay = $course->coursedisplay;
+            }
+            if ($sectionno != 0 && $usercoursedisplay == COURSE_DISPLAY_MULTIPAGE) {
+                $url->param('section', $sectionno);
+            } else {
+                if (!empty($options['navigation'])) {
+                    return null;
+                }
+                $url->set_anchor('section-'.$sectionno);
+            }
+        }
+        return $url;
     }
 
     /**