Base

This PR primarily addresses issue #33, but also includes a refactor of the pypad code that plots the CSPAD on in a left panel and integrated intensities in a right panel.

@sellberg @rkirian : if one or both of you guys can check out this branch and give the new `tweak` script a whirl, report bugs, etc, that would be awesome.

The script is currently slow but pretty full-featured. I've only tested gold, though. @sellberg, maybe you can test ice?