Dropped old no longer used CopyDocumentsToRemoteClient functionality.
Taskreport: Use current_org_unit instead of current_client_id.
SendDocument: use current AdminUnit to get the public url.
Dropped no longer used workaround for disabled clients.

The workaround which disallow communication for disabled clients,
is no longer needed, this is solved by communication with the customer.
Dropped get_current_client and use current OrgUnit instead.
Merge pull request #297 from 4teamwork/pg_dropped_old_transport_functionality

Dropped `get_current_client` helper.