VPT2-screened PyVCI Files

Changes matrix format from the old one used in PyVCI to the new
one in PyVCI_VPT2. Some changes to the format had to be made, to
allow for more flexible construction and manipulation of the VCI
matrices.

First, clean the directory of old files,

./make_clean

Then, convert "to_new_format.pyx" to C using Cython, by calling

python setup_cyth.py build_ext --inplace

which will do the conversion and compilation. If there are 
problems with the generated C code, than try using one of
the versions supplied in "code/C_code_Py27" or "code/C_code_Py34",
which were converted with Python2.7 and Python3.4 respectively.

After that, assuming you have your vci_matrix in an old format
in the same directory and under the name "fin", call

./change_format.py fin fout

to generate a new matrix file "fout", in the format compatible
with PyVCI_VPT2.