Added option to use Drupal username or uid as default in a field. Also, a few other details and refinements.

Renamed filemaker_filemaker_object() to filemaker_object() and made $node option in filemaker_is_error() so the function could be used  in admin.inc, which doesn't have a node.

Fixed a bug with default Drupal view (browse feature): node needed to be passed in now that we aren't using arg().

Added deletion confirmation form and removed the rest of the calls to arg(), unless they made sense.