Fixed the 'Undefined index "user_id"' bug when requesting a publicly shared folder and being logged-out.
The OC_App::navigation array contains by default only the help menu.

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.

add status file. useful for external administration. show the ownClopud version at least in the config dialog.

Create OC_JSON class, for single point of creating json responses.
No real logic change, this just cleans up the code a bit.

When uploading a file using davfs php warned about a missing argument to
OC_FileProxy_Quota::preFile_put_contents(). Since we get a resource from
OC_Connector_Sabre_File->put(), we have to convert that before running
strlen because it expects a string.

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

This also moves session_start in lib/base.php down a bit because we need
OC::$SERVERROOT to get the config settings.

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

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

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

Created the following function:
 - checkLoggedIn
 - checkAdminUser
 - redirectToDefaultPage

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

One central place to check for https.