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
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
add filename of original file to download
don't save row if no changes where made

fixes error when saving pageProperties of Trl
Check if Image really is uploaded
Implement hasContent for switchLanguage-Component
added jQuery Plugin Transit with Fallback

makes it easy to animate elements with css3 transitions and if this is not supported it fallbacks to jQuery animate
added jquery easing plugin

for custom easing effects in jquery
Kwc_List_Fade_Component works now with jquery and css3 animations

if the css3 animations are available listFade animates with these, else with jquery animate
for more support in modern/mobile browsers
add filters for redirects
for path redirects make ending / optional
set standard animation type of Kwf_js/EyeCandy/Fade/Elements.js to fade
correclty check if db exists
fix events when deleting page
fix events when something is invisible