A Significant Revision

Geoff's last version:

    sub new { ... }

    sub complete_build {
        my $self = shift;
        $self->verify_values ();
        ...
    }

My latest version:

    sub new {
        ...
        $self->validate_values();
        ...
    }

    sub complete_build {
        my $self = shift;
        ...
    }