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  BORDERCOL       (FOREGROUND)    Default border colour
  CAPTIONCOL      (FOREGROUND)    Default caption colour

As a final note, here are some rules regarding the structure of your
configuration hash.  You *must* save your state information in this hash.  
Another subroutine will copy that information after object instantiation 
in order to support the reset method.  Also note that everything stored 
in this should *not* be more than one additional level deep (in other 
words, values can be hash or array refs, but none of the values in *that* 
structure should be refs), otherwise those refs will be copied over, instead 
of the data inside the structure.  This essentially destroys your backup.

If you have special requirements, override the _copy method as well.

=cut

sub _conf {
  my $self = shift;
  my %conf = @_;
  my ($df, $db, $c);