#68170 by xtony and Heine, Use basename not pretty name in theme_get_settings()., backport from HEAD

#56508 by chx (modified), Remove notices from form.inc and move theme_form_element from theme.inc to form.inc., backport from HEAD

#51002: Admins could not see unpublished comments (plus minor usability enhancements for previewing/unpublished)

- Patch #15609 by m3avrck: get rid of forced <br />-tag after <label>-tags.  Makes it easier to theme forms.

- Patch #38279 by paddy_deburca: fixed theme_item_list() not to generate an empty <ul></ul> tag when $items is empty.

  Deprecates the primary_links module.

  This patch was much needed.  Thanks Richards!

  NOTE: if some themers could investigate if there is room for improvement
        with regard to theming, that would be awesome.

  TODO:
  + The contact.module was broken; a new patch for contact.module is needed.
  + Documentation is needed.
  + The most important modules need to be updated ASAP.