panels 6.x-3.4

Changes since DRUPAL-6--3-3:

• Introduce the Panels stylizer module which builds on the CTools stylizer base to create user definable, recolorable styles.
• #746568 by mgriego: Disable block caching for mini panels.
• #655268: Fix a problem retrieving cached content created by #634746.
• #745808 by Robbert: use number_format() in flexible width calculations to ensure locale settings cannot bork generated CSS.
• Issue #765978 by joshk: Added watchdoggery and a hook to
  panels_display_save().
• panels_sanitize_display() is superfluous; removed it.
• Issue #763584 by neclimdul: Add a link to the block configuration page
  for mini-panels that takes the user to edit that mini-panel.
• Catch the CHANGELOG up to date.
• Issue #739992 by hefox: Minor docblock touchup.
• Stopped wasting cycles trying to render a mini panel in a block when we
  know the mini panel doesn't exist.
• Removed panels_print_layout() and related functions, as that rendering
  approach was old and crusty.
• Issue #779012 by c960657: implement the callback for a single
  content_type subtype in panels_mini to improve performance with large
  numbers of mini panels.
• Empty method erroneously committed; now removed.
• Security updates: protect the importer with the 'use PHP for block
  visibility' permission.
• Minor touchups to the French translation.
• Slight docblock touchup.
• Removed old D5 cruft from the panels_node hook_menu() implementation.
• Issue #798954 by dixon: Pass $form_state to style plugins' validate and
  submit callbacks.
• Update CHANGELOG for release.