[hashcash] minor bug fixes -- hashcash-1.22 released

hashcash-1.22 provides a bug fix for a display glitch in the progress
(-P) option as reported by Phil Marek.  No other reason to upgrade.

CHANGELOG entry:

hashcash-1.22 - 08-Apr-2006 - Adam Back <adam@xxxxxxxxxxxxxxx>

        * fix progress display bug reported by Phil Marek.  (When the
          progress reached 2^30 tests, it would reset the best seen).
          This involved multiple related bug fixes, complex thing to
          debug!

        * make percentage progress show more precision the larger the
          stamp, so progress is less boring.

        * remove some cruft from test.sh so it works again

        * change docs and code output to talk about partial hash
          preimages instead of partial collisions, as this is a more
          accurate description these days.

Adam

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