LDAP: implement userCount action. This required to (finally) clean up and refactor the search method, which will have a positive performance impact on paged search.

numRows on Oracle always seem to return 0.

This fix removes numRows usage from the encryption and sharing app.

This fixes unit tests and potentially the encryption app itself
(migration status) when running on Oracle

extend the encryption stream wrapper to handle local files and add a fall back for file size calculation if the storage doesn't support fseek