I guess I made a commit from hpc that I didnt' really think too hard
about

I'm still torn on how I want to do the argon plasma solver. I believe
the goal is to have the finesse determined by the calibration and to get
the valley counts above the read noise to avoid an offset. This would
allow a naive 3 paramter fit when the velocity doesn't matter.

Conflicts:
	bin/run_finesse_solver.py
	fabry/finesse/argon_solver.py

Conflicts should be fixed by keeping the hpc_ready body. Most of the
conflicts caused by running non hpc code on skywalker / testing.

run_multi_solver.py is a script that reads in a config file for the
location of the argon_input.h5 files and the chord radius locations and
then runs a multinest solver for Ti and the PCX velocity profile using
all of the images.

plasma.py had functionality added for calculating the momentum diffusion
length, Lnu, using charge exchange cross sections (also added).

argon_plasma_solver.py had minor edits for various functions. The big
change is adding the multi image solver.

check_argon_solver had minor edits for various functions. The big change
is adding the multi image solver check functionality.

Wrap import matplotlib in try/except for HPC