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
Set model only if no model is set

e.g. if a web wants to store newsletter subscriptions as a backup
Fix afterDuplicate to support events as well
Check additional Roles only when there exist some
add action that copies trl contents from one language to another
Remove readfile_chunked again

Causes Problem with some servers
Add _allowFrontendUrls() to User Row
Use correct variables
E-Mail is case insensitive

Fixes that a user already exists error occurs when changing e-mail adress to upper or lower case
added missing admin width componentToString function
added missing admin.php
add filename of original file to download
don't save row if no changes where made

fixes error when saving pageProperties of Trl
only set html body if one exists
Check if Image really is uploaded
Implement hasContent for switchLanguage-Component
add own language for Chile, copy from es
disable modelObserver
allow _ and uppercase letters in language