Yet another Levenshtein module written in C, but a tad more flexible than
the rest.

This module uses code from PostgreSQL's Levenshtein distance function to
provide the following features on top of plain distance calculation as it
is done by Levenshtein::XS and others:

* Distance-limited calculation: if a certain maximum distance is exceeded,
the algorithm aborts without result. This helps performance in situations
where
it is clear that results over a certain maximum are not useful.