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=head2 B<add_witness>( %opts )

Instantiate a new witness with the given options (see documentation for
Text::Tradition::Witness) and add it to the tradition.

=head2 B<del_witness>( $sigil )

Delete the witness with the given sigil from the tradition.  Returns the
witness object for the deleted witness.

=head2 B<rename_witness>( $oldsigil, $newsigil )

Safely rename (i.e., assign a new sigil to) the given witness. At the moment
this can only be done when the witness does not yet appear in the collation.

=begin testing

use TryCatch;
use_ok( 'Text::Tradition', "can use module" );

my $t = Text::Tradition->new( 'name' => 'empty' );