improved vme plot. Specific params for plotting current
added smoothing script taken from online cookbook
working basic plot with smoothing and colors
finished basic plotting of multiple shotnums
added vme_basic_2d_plot for generic plotting of vme readouts
Added two plot functionality (e.g. volt & current)

Used plt.subplot() and call vme_basic_2d_plot to implement
plotting of two signals with common a common time along
the x axis.

Used subpot_adjust(hspace=0.001) to put one plot right on top
of the other.
added/sorted plotting functions

Generic plots can be found within vme_plot while more specific plotting
functions are implemented vme_plot_specific.

* Implement vme_plot_current for basic plots of the current.
* Moved vme_plot_current to vme_plot_specific.py