Fix of redundancy in utils/plotUtils.py and pydarn/plotting/fan.py fixed.

Some plotting was done twice when using fan.py.  Within the plotFan function parallels, meridians, continents and coastlines were drawn with methods acting on the map object, but that had already been done when the map object was created.  Also there were two versions of datetime object keyword (datetime and dateTime) in the __init__ of plotUtils.py.