o added new features:
o -G: generate a new paramsfile that produces the same
key as the old paramsfile,
o ffs verify_method,
o multiple keygen methods that are xor'ed together
(for n-factor authentication), and
o calibrating the iteration count of PKCS#5 PBKDF2 to
the current machine's speed.
o changed paramsfile format to allow for the new features.
o replaced open-coded parser with yacc grammar.
o lots of supporting changes.
o updated documentation to reflect new features and new
paramsfile format.
to reprompt for the passphrase if the key does not meet certain
criteria. The currently implemented methods are ``none'' and
``disklabel''. The first behaves in the original fashion, the
second will scan for a disklabel on the cgd after configuration
and if it does not find a disklabel then it will reprompt for the
password and reconfigure the disk.
