On the update page, config.js was missing which caused oc_webroot to not
be available. That would trigger the faulty oc_webroot fallback that
didn't take URLs like "/owncloud/index.php/files/apps" into account.

This fix adds config.js in the update page and also a fix for the
oc_webroot fallback, in case it is used elsewhere.

The file on disk is encrypted, and not readable on client systems

This reverts commit eba35d28.

add a optional parameter to skip check for expired files, this is necessary to find out to whom a file was shared after it was expired.

This reverts commit 2a7380cc.

This is to make sure that method isn't broken

Fixed touch after chunk assembling which was using the wrong path,
resulting in the creation of an extra file.

Fixes #6007

make 5.3.8 the minimum supported version. This fixes several issues with broken PHP versions like: https://github.com/owncloud/core/issues/5734
Also make the version compare clearer. It was pure luck that floatval on a php version returned the correct value.

make sure that we don't try to access an already deleted files, fixes some file source not found warnings