more secure way to update the database

[command] single user mode - use config object & add tests

Add getUserFolder to IRootFolder

No more leaking of mounttype via metadata or icon in public shares.

Add indexes to speedup DB queries

Add is_dir check to getAllApps() function

* file_target is often used in the sharing code in JOIN statements for retrieval of shares

Fix the path for users which have an exception for a group share

[config sample] improve RST markup and wording

Remove 3rd party text for disabled apps on update

Keep update page when there are warnings

autotest.sh with docker support for postgres

Add "occ config:*" to manage config values

Whenever there were warnings during an update, the page will not be
redirected any more.