FV port validation

This plot compares the perturbation growth on moab (a pc using the lf95 compiler) with the difference growth of runs on anchorage (pc cluster using lf95), bluesky (ibm, p4), and chinookfe (sgi, o2100), all difference with the run on moab. The closeness of the perturbation and difference growth curves validates that cam2_0_2_dev25 produces the same simulation for the FV dycore on all 4 machines.