First work on integrating IBTrACS best storm data.

So far all that's happening is load.py plots Wilma's path,
and detect.py does the same but from the C20 data.

detect.py was sped up significantly by not redoing lon/lat interp func
for each isobar. Calc'ing some basic stats such as vorticity/psl for
each cyclone (not working properly yet).