scheduler 6.x-1.4

WARNING: This release is broken. Do not use. Release 6.x-1.5 will be available in a matter of hours, maybe tomorrow (2009/07/13). Sorry for the inconvenience.

Notable changes:
- special permission for administering scheduler
- new tab in admin/content/node for viewing all scheduled nodes without views module
- publish and unpublish dates in the past are not allowed anymore

The dirty details:
#334128 by greggles: Fixing php warnings.
#355934 by Gerhard Killesreiter: Wrong permission key for scheduler adminstration page
#431510 by jonathan1055: Change permission for admin setings to 'access administration pages'
#435708 by geodaniel and yarimbiyik: Menus should not be passed through t()
#344138 by syscrusher and jonathan1055: Displaying list of scheduled nodes (contrib)
#344138 by jonathan1055: Adjust column headers of list of scheduled nodes to the usual values
#344138 by jonathan1055: Adjust default ordering of list of scheduled nodes to the usual values
#442554 by ericschaefer: Set permission to change format string to 'administer scheduler'
#442554 by jonathan1055: "access admin pages" is too permissive for allowing user to change scheduler settings (forgot hook_perm)
#457630 by jonathan1055: Get values from form not db when doing preview
#429004 by jonathan1055: Disallow publish_on and unpublish_on dates in the past
#453060 by ericschaefer: Records don't get removed from scheduler DB table