Sat Aug 9 10:48:53 EDT 2014

Fix PDP / libprim.

Yeah, long term thing here.  Not sure what to do with it.  Basic point
is that in the last 10 years I gained some knowledge that would be
very useful to bring PDP[1] into a maintainable state, and also have
the core exported as a general purpose library[3].  Mainly a link to
RAI would be a good thing[2].

[1] http://zwizwa.be/darcs/pdp
[2] https://github.com/zwizwa/rai
[3] http://zwizwa.be/darcs/libprim