ImageEnlarge does not extend Basic_Image, so deleting cache for useParentImage was not called

Do not merge into 3.0 ;-)
added missing admin.php for headlines component
only set html body if one exists
move resource class into own file to support unserializing it
add some benchmark checkpoints
add cache for acl

todo: correctly update/clear cache when eg. components get added
improve benchmark output
extend benchmarks
extend benchmarks
add events to delete acl cache
forms in frontend automatically redirect to https
if automatic redirect to https was done automatically redirect back

if the user chooses https manually leave him there.

this is done by adding a cookie while the automatic redirect is done
use https for sessions
don't allow user logins without https
add support for server.httpsDomains setting

using that domains with certificate can be configured (in case not all have one)
set feAutologin cookie only for https if https is activated
add method that returns if https is supported and use it where appropriate
dynamically evaluate if https is supported
add second cookie for autologin that is not only set on https
add cache for requestHttps search