devel/py-python-dtrace: create port

DTrace consumer for Python based on libdtrace.

Currently this package provides two modules: one wraps libdtrace using ctypes.
The other one uses cython.

WWW: http://tmetsch.github.com/python-dtrace/

PR: 217419
Submitted by: Graeme Jenkinson <gcj21@cl.cam.ac.uk> (with changes)