adding python-ptrace 0.6.5 patched

This is the original python-ptrace 0.6.5 from haypo
https://bitbucket.org/haypo/python-ptrace
with the patch from ChrisM to get tracing of cloned process working
https://bitbucket.org/ChrisM/python-ptrace

Signed-off-by: Luca Clementi <luca.clementi@gmail.com>
include local python-ptrace before system one

first we want to have the local path in the python_library so that our
local patched python-ptrace is included before the system one

Signed-off-by: Luca Clementi <luca.clementi@gmail.com>
if python-ptrace is not the patched version give proper error message

Signed-off-by: Luca Clementi <luca.clementi@gmail.com>
Documented the patched version of ptrace in the README

Signed-off-by: Luca Clementi <luca.clementi@gmail.com>
Updated license with GPL2 for python-ptrace

Signed-off-by: Luca Clementi <luca.clementi@gmail.com>