Rosetta modifications

[ngreenwald]

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What is the purpose of this PR?

Updates the rosetta workflow for improved usability and speed.

How did you implement your changes

1. Reorganized the notebook to emphasize changing only a single source channel at a time, rather than both Noodle and Au, as this was the approach I took.
2. Add flat field correction for mass 39 to remove gradient across the image
3. adds a helper function get_masses_from_channel_names to allow the user to specify channel names rather than masses
4. Reorganize create_tiled_comparison to only read in data for one channel at a time, which results in significant speedup

Remaining issues
Once Hadeesha has finished testing his coefficients, we'll transition this notebook to evaluation purposes only. This will basically be a simple interface to making a stitched comparison of a pre- and post-rosetta. We'll hide the stuff about changing rosetta to emphasize that the defaults should work quite well for everyone

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