List of things to do in duff
============================

Functionality
* Change to getopt_long and add long options.
* Implement i18n through gettext.
* Detect duplicate file arguments?
* Detect duplicate directory subtrees?

Documentation
* Add ALGORITHM section (or similar) to manpage.
* Add more examples to manpage.

Optimisation
* Make directory cache less stupid and slow.
* Do smart stuff to make things go faster.
* Change linear lists into hash tables or trees?
* Compare contents directly for clusters of two in excess mode?

