The getfile routing code was absolutely legacy and not needed anymore. Additionally \OC::$REQUESTEDAPP was never set to the actually accessed application.

This commit removes the legacy routing code and ensures that $REQUESTEDAPP is always set so that other applications (e.g. the firewall or a two-factor authentication) can intercept the currently accessed app.

Testplan:
[x] Installation works
[x] Login with DB works
[x] Logout works
[x] Login with alternate backend works (tested with user_webdavauth)
[x] Other apps are accessible
[x] Redirect on login works (e.g. index.php?redirect_url=%2Fcore%2Findex.php%2Fsettings%2Fapps%3Finstalled)
[x] Personal settings are accessible
[x] Admin settings are accessible
[x] Sharing files works
[x] DAV works
[x] OC::$REQUESTEDAPP contains the requested application and can be intercepted by other applications

1. We're maintaining the same code twice which leads inevitably to problems as this one. The createHtaccess routine is only used to use the correct paths to the 404 and 403 document.
2. Updating the ownCloud instance as described in our documentation (`Delete everything from your ownCloud installation directory, except data and config.`) will break the links to the ErrorDocuments anyways and show the default error handlers if ownCloud is not installed in the root directory.

Add JS redirect if that fails (HTTP-based redirects are disabled by
default in more recent Firefox versions).

php_value can only be used with mod_php, using it with FCGI will cause 500 Internal Server errors.  This needs to be set in php.ini manually or set using ini_set().

This reverts commit e1478117.

add caldav and carddav files in their old place for backward compatibility - add rewriterule for caldav and carddav

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

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

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