add python interface

[adammoody]

This adds a draft version of an mpifileutils.py interface to libmfu. It uses CFFI:

https://cffi.readthedocs.io/en/latest/index.html

It's currently written assuming python 2, and it is hardcoded to assume that the library is installed to ./install/lib64/libmfu.so.

Examples on how to use the interface are shown in mfu.py. One might run this test program as:

srun -n2 python mfu.py

Signed-off-by: Adam Moody [email protected]