rename postprocess.py

[timflutre]

Would it be possible to rename postprocess.py into bmagwa_postprocess.py? This way, it is easier to add it to the PATH without having the risk of having a synonym from another software.

Moreover, could you also add this line at the top of the file: #!/usr/bin/env python? (Or what is the reason not to do it?)

ps: I can propose a pull request if you want

[to-mi]

Thank you, your suggestions make sense. I made the changes.

[timflutre]

Thanks!