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C<commit()> and C<rollback()> methods.  When you create a
Data::Transactional object, what you really get is one of these tied
structures, reblessed into the Data::Transactional class.  The
transactional methods simply call through to the same method on the
underlying tied structure.

This is loosely inspired by L<DBM::Deep>.

=head1 BUGS/WARNINGS

I assume that C<$[> is zero.

Storing blessed objects in a C<Data::Transactional> structure is not
supported.  I suppose it could be, but there's no sane way that they
could be transactionalised.  This also applies to tie()d objects.
Please note that in the case of tie()d objects, we don't do a great deal
of checking, so things may break in subtle and hard-to-debug ways.

The precise details of how the transactional methods affect sub-structures
in your data may change before a 1.0 release.  If you have suggestions for
how it could be improved, do please let me know.