(#123) Fixed beam not being able to access global namespace + minor related bug. #124
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The beam pipeline wasn't able to see the global namespace, despite that save_main_session=True was passed to the pipeline options. I'm not sure why save_main_session wasn't having its intended effect, but I worked around it by importing the global symbols that the pipeline wasn't able to see.
I also noticed that the save_main_session argument to run() wasn't actually doing anything, and that argument to the pipeline was always set to True, so I fixed that.