HvD: Further optimized nwad_dble_powx and nwad_dble_powix by taking  care of the y, (y-1) and (y-2) prefactors.
HvD: Further optimized nwad_dble_powx and nwad_dble_powix by taking 
care of the y, (y-1) and (y-2) prefactors.





rangsimanketkaew/NWChem