Port to drupal 6.0

I ran the Coder (code review) module and it guided me through a few changes for porting to 6.

There are a few remaining issues:

      Line 458: new hook_theme() function is required to register theme_ functions (Drupal Docs)
      function theme_copyright_admin_overview($form) {

      severity: critical Line 85: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
        if ($may_cache) {

      severity: critical Line 86: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
          $items[] = array(

      severity: critical Line 93: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
          $items[] = array(

      severity: critical Line 99: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
          $items[] = array(

      severity: critical Line 106: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
          $items[] = array(

      severity: critical Line 112: The menu system has been completely over-hauled in 6.x. (Drupal Docs)
         $items[] = array(

      severity: critical Line 533: hook_form_alter() parameters have changed (Drupal Docs)
      function copyright_form_alter($form_id, &$form) {

copyright.install

      severity: critical click to read more Line 17: A new schema API has been added in 6.x (Drupal Docs)
        switch ($GLOBALS['db_type']) {

      Explanation: This patch caused changes to the format of hook_install(), hook_uninstall(), and hook_update_N(). No longer are switch statements done on $GLOBALS['db_type']; instead, use the variety of schema API functions to perform table manipulation.

      severity: critical Line 176: db_next_id is deprecated. Use db_last_insert_id instead. (Drupal Docs)
            $cpyid = db_next_id("{copyrights}_cpyid");

      severity: critical click to read more Line 208: A new schema API has been added in 6.x (Drupal Docs)
        switch ($GLOBALS['db_type']) {

      Explanation: This patch caused changes to the format of hook_install(), hook_uninstall(), and hook_update_N(). No longer are switch statements done on $GLOBALS['db_type']; instead, use the variety of schema API functions to perform table manipulation.

      severity: critical click to read more Line 296: A new schema API has been added in 6.x (Drupal Docs)
        switch ($GLOBALS['db_type']) {