auto_expire 6.x-1.0-rc1

Initial port to D6, including:

• #313280: Port to D6 by EvanDonovan
• #464776: Views integration in D6 version by marcvangend
• #237450: When user tries to extend expired node, its expiration time is calculated starting from expiration date, but not from now. by CoPut and marcvangend
  On extension, new expiry date is now calculated as the max of now()+$days and $expire+$days.
• #237452: After extending doesn’t return to published state automatically by CoPut
  On extension, a node is now automatically published.
• code clean-up following Drupal coding standards
• various minor improvements and bugfixes