Fix PGP implementation The pyme API has changed significantly since this worked (API is now better). Add regression-test for PGP support (this isn't run if pyme isn't installed). We're testing only reception of a signed message for now.

Python compatiblity TODO
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- the popen2 module is deprecated as of Python 2.6;
  the subprocess module is available since Python 2.4,
  thus a roundup.anypy.subprocess_ module is needed

# vim: si