Spectra rebinning and other small changes

The L2 MSPC and SSPC spectra are now rebinned into a standard set of energy channels and have their units converted to cnts/keV/sec. FSPC has its channel edge energies calculated, but nothing is done with the info yet. FSPC counts are now in cnts/sec for L2.

There were a few small changes to the meta data in the skeleton CDF files and a few variable types were reduced to save space.