Basic python3 compatibility

[mjziebarth]

Hi everyone,

these are the steps I took to make the Network class run on my machine with python 3. I see there has been some effort to port it to python 3 and so I felt these steps may be welcome.

There is four basic changes I performed:

• Add brackets to print()
• remove the ProgressBar if run on python 3
• Fix some .c file name discrepancys between setup / actual file names
• Use pickle instead of cPickle if run on python 3

These changes should not affect pyunicorn on a python 2 machine, but I did not test that. I also did not do any extensive testing on python 3, so some code may still not run. The basic Network-class operations I performed did work.

What do you think? I would be glad if you could review the changes and possibly merge.

Regards!

[ntfrgl]

Thanks a lot for your contribution!