removed bug, that the drag and drop function added 24h to the duration of the event, after moving an event from allday to a time

Conflicts:
	core/templates/login.php
	index.php
	lib/util.php

added jquery ui icons. otherwise its for casual users impossible to close the new event dialog in the calendar

Filled username field when oc_username is set repaired.
Problems with "advanced settings" button in installation wizard fixed.
CSS improved - login and installation now looks more clean.
Request password link removed (email feature not implemented yet).
Database radio button bugs removed.
It is possible to have an empty database password, now ownCloud will support this "security issue".
Ignore Mac OS X ".DSstore" files.
Fade in/out of login button and remember checkbox removed due to some display errors.

This reverts commit 7fb89c53.

The rfc [1] only mentions "DATE-TIME" and after this change events
created in the web ui can be imported by lightning. Before it threw a
syntax error.

[1]: https://tools.ietf.org/html/rfc5545



Signed-off-by: Florian Pritz <bluewind@xinu.at>

From commit 71706282

Revert "commented out colorfield in edit calendar dialog, because colors aren't implemented yet (it would just confuse the user)"

Implemented the calendar color as background of the events.

This reverts commit 59d4ddd9.