Issue 8: insert() should handle objects
Reported by funnyso...@gmail.com, Jun 9, 2009
as well as:

    $dbrh->foo->insert( abc => 1, bar_id => $bar_id );
    or
    $dbrh->foo->insert( abc => 1, bar_id => $bar->bar_id );

should be able to:

    $dbrh->foo->insert( abc => 1, bar => $bar );
    or:
    $dbrh->foo->insert( abc=> 1, bar => $bar_id );   # maybe