Adding adjoint source section to the tutorial.
Adjusting launch_misfit_gui command.
Processing tag now determined by the iteration class.
Misfit GUI works for the new iteration structure.
PEP8
Misfit GUI has weight selection interface.

Not actually working yet, but the weight selection does work.
Removed station weight from window.

This is handled by the iteration files.
Small change in the window xml file.
Misgit GUI now also plots the window weights.
Cosmetic improvements to the Misfit GUI.