fine tuned the smoothing and threshold for plasma breakdown time
changed color scheme to brewer colors
Added filtfilt and butter filter for heavy_current_low_pass
added filtering parameters like gen.prefilter
modified plotting functions to have specific smoothing for each diag
fixed minor bug in vme_plot
minor bug.  Did 10MHz sampling instead of 100MHz sampling again
fixed order of operation error in get_b_from_bdot
minor cleanups.  clarification