Add whisker plot for focal plane.
Ignore .pyc files.
Use more specific DATE strings
Change stamp size from 32 to 48.

Bob suggested that this may be why I am seeing a slight discrepancy
in the size of PSFEx models compared to the data.  However, this
change did not make any difference.  There is still essentially the
same mean size offset.  Still, probably worth keeping nonetheless.
Go back to plotting everything in plot_mag.py
Add measurement of PSFEx shapes using Erin's code