Proposed new step: p:uuid

The p:uuid step returns a UUID:

<p:declare-step type="px:uuid">
  <p:output port="result"/>
</p:declare-step>

It could probably have some options/parameters to request different
kinds of UUIDs, but I haven't done enough investigation to know
exactly what they should be (or if they're needed).

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | Where it is permissible both to die and
http://nwalsh.com/            | not to die, it is an abuse of valour to
                              | die.-- Mencius