Split wrfout formally into wrfout and wrfstat for wrf-faster branch
Created by: wgustafson
We need to separate the LES statistics output into their own output file to simplify & speed up data bundle post-processing. Outputting into a separate file will be straightforward. The trickier aspect will be permitting a different output frequency between wrfout and wrfstat--Satoshi has cautioned that there are counters/issues that currently prevent this from working correctly. In the interim, we can include a check that stops the model of the output intervals do not match.