Initial work on resetting forgotten passwords. It works, but still need to email a token to allow reset

* Forms have been revamped (CSS + javascript),
* Process has been improved : errors are displayed on the form page,
* Some changes in the index.php page so that everything related to installation is in lib/setup.php
* Also added a small function in OC_HELPER class to set input values.

All these should improve the installation process in terms of ergonomics.
Well, I do hope so.

Start of the refactoring. Commit is quite big because I forgot to use git right from the beginning. Sorry.

add Open Collaboration API support. You can now connect your ownCloud with the KDE Social Desktop and push notifications to your Social News Plasmoid. This requires KDE trunk or KDE SV 4.5

<br /> is not a valid strict xhtml1.0 tag. Not semantic. Replacing it by CSS instructions on semantic tags.