can read images and select the proper frame
fixed bug where x and y axis got mixed up
Removed plot_diff_mpa_for_shots

Having this function seemed to detract from the main library.  For
customized plots, like the one that has been removed (purpose of that
plot is to subtract out no strapping field component), I will put them
in a separate programming git library: baothecow-programming
generalized plot_sol_mpa_for_shots to plot 1-4 probes
Generalized EXP.  Default value is NOTSET

* By default the EXP variable in parameters which corresponds to the
* experiment is 'NOTSET'
* If the user does not explicitly set this variable, the program will
* assume either solar or singeloop experiment.
* By explicitly setting this variable and defining the corresponding
* paths, it is possible to use the library for other set-ups.