DART $Id$

This is a uniform PV two-surface QG+1 spectral model contributed
by Rahul Majahan. 

The underlying model is described in:
Hakim, Gregory J., 2000: Role of Nonmodal Growth and Nonlinearity in 
Cyclogenesis Initial-Value Problems. J. Atmos. Sci., 57, 2951-2967.
doi: 10.1175/1520-0469(2000)057<2951:RONGAN>2.0.CO;2


