Create stand-alone executable

[haasad]

To make the activity-browser easily accessible to non-python users, a standalone executable would be required. The most promising way to do this is with pyinstaller, especially because it allows to build self-contained python applications for all major platforms.

A standalone executable would also make it necessary for the activity-browser to have the option to import databases from raw data (ie. ecoinvent db from ecospold).

[haasad]

Because the activity-browser uses a GPL-license, packaging together with eg. MKL is legally not allowed and brightway relies on numpy MKL for speed. See extended discussion from the Julia developeres here. Closing this for now.