do not create a db if already existing .. and reset the user password instead of creating if the user already exists

generate a random salt during installation and store it in the config.php. use it to salt the password hashing.

the ',last' breaks all other rewrite rules and is also not there in the committed .htaccess, so removing it. anybody know why it was there?

Fixes:
http://bugs.owncloud.org/thebuggenie/owncloud/issues/oc-232
http://bugs.owncloud.org/thebuggenie/owncloud/issues/oc-445

This way the config.php file is not changed every time you go to the
personal page. Step to make it possible to have a read-only config.php
most of the time

having a broken web/card/caldav is much better as having no ownCloud at all :)

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.

Removed global vars are DOCUMENTROOT, SERVERROOT, SUBURI, WEBROOT and CONFIG_DATADIRECTORY

Signed-off-by: Aloisio Almeida Jr <aloisiojr@gmail.com>