use browndog to download and prepare met data from NARR in regional workflow

[dlebauer]

need to add a tag to the settings file like ...

 <browndog>
  <url>http://dap.ncsa.illinois.edu:8184/convert/</url>
  <username>browndog.user</username>
  <password>GritGin3</password>
 </browndog>
...
  <site>
   <lat>39.0561</lat>
   <lon>-95.1907</lon>
  </site>
  <inputs>
   <met>
    <source>NARR</source>
    <output>SIPNET</output>
   </met>

Presumably adding this and replacing lat/lon with the grid of points in NARR that cover Illinois (see points as csv and R code here: https://gist.github.com/dlebauer/4bb59862352b7b9391cd). Then, it will be possible to run over the grid. Need to review with @robkooper