xmlsitemap 6.x-2.0-unstable4

Changes since DRUPAL-6--2-0-UNSTABLE3:

• by Dave Reid: Fixed spelling error and mismatched test string.
• by Dave Reid: Removed unnecessary backport code.
• by Dave Reid: Jiggered with translated strings.
• by Dave Reid: Moving around xmlsitemap_form_submit_flag_regenerate() and _xmlsitemap_add_vertical_tabs().
• by Dave Reid: Don't run xmlsitemap_check_status() on non-admin pages.
• by Dave Reid: Moved multilingual XML sitemap features to xmlsitemap_i18n.module.
• by Dave Reid: Don't collapse the link fieldset if inclusion or priority were overridden.
• by Dave Reid: Rework xmlsitemap_settings_list() to xmlsitemap_add_form_type_summary().
• by Dave Reid: Removed unnecessary vertical tabs code now that http://drupal.org/project/500044 is fixed.
• by Dave Reid: Added a 'developer mode' setting and cleaned up the rebuild page.
• by Dave Reid: Updated translation templates.
• by Dave Reid: Being anal retentive.
• by Dave Reid: Expanded node tests.
• by Dave Reid: Removed unnecessary test.