Tweaks to test on netbook

1) Add "netbook" machine because Ubuntu puts netcdf in /usr/
2) Added "-local" option to check out repo from ~/codes/CVMix instead of
   pulling it down from github

I didn't want to use "darwin" because netbook is not bfb with the two Macs
that I test on (mini at home and macbook at work)
Ignore whitespace in diffs