/**
 * Implementation of hook_enable().
 *
 * Insert course as product and add admin theme to course settings.
 */
function course_enable() {
  // Add course settings to admin theme.
  $paths = variable_get('admin_theme_path', '');
  if (strpos($paths, 'coursesettings') === FALSE) {
    $paths .= "\n*/coursesettings";
    variable_set('admin_theme_path', $paths);
  }
}