* When saving a netconfigs file, citserver now copies

* When saving a netconfigs file, citserver now copies
  the tempfile to the permanent file using native code instead
  of calling /bin/mv.  Hopefully this will permanently solve the
  (now rare) issue where netconfigs files disappear.
* Allow users to retrieve and store netconfigs files for their
  own mailbox rooms.  This will be required for configuration of
  POP3 aggregation, and in the future it will be required for
  RSS aggregation.