Committing version 0.2 of u-pki from around ~ 2009-09.

This commit encompasses all files from the archive ../u-pki_0.2.tgz which has the following checksums:

- md5sum: 9cf484d090fd282eee77e4e3d8697933
- sha512: 08523f6e91b9b49c30844da95325c286e9f0fea480f3084132f83c24bdf8e3069d148675f766ce9bfd90bb5bd3d0c917bd0ec26c9d70241f8ee39602ef9a2202

AFAICS this version has basically 2 changes:

- Much improved documentation.

- INBOX and OUTBOX (basically spooling directories for receiving certificate requests and
  sending signed certificates) can now be overridden by command line arguments.