validate resource's integrity before using it

Allow specifying the compare-array for insertIfNotExists()

Always display max upload size in admin panel

Expire files from the trash in the background

verify the file name length not to exceed 255 characters + verify path d...

drop any fallback code related to curl

Put notice about checking logs in setup warning

Fix getting the avatar of a non-existing user

Use proper error type and clean-up code

Drop example user backend

We already provide an interface for application developers, this file is outdated and thus should get removed.

Addresses No. 3 from https://github.com/owncloud/core/issues/14847

Remove OC_User_HTTP

Can also be null

If the user does not exist this returns null and can lead to nasty bugs since the IDE is not indicating this...

support paged results against 389ds.

Addresses No. 1 from https://github.com/owncloud/core/issues/14847