standardplots anptime plots ckey is incorrect

[jaythespacehound]

Currently amp+phase versus time plots use "ckey src" which is great for the one that produces a plot for the whole experiment.
This is a change from previous plots that showed the polarisations in different colours.
The "zoomed in plot" ($start-5m to +55m) should use "ckey p['RR']=2 p['LL']=3."

We now seem to also be plotting multiple subbands. This should probably be changed back to only one in both plots as this makes them very difficult to interpret/follow.

This will likely require a rewrite for the plot functions to support kwargs.
Additionally command line argument should be replaced to use argparse.