[WIP] port to Garnet

This builds Proteus on Garnet, the Cray XE6 at ERDC.  Note that most of the source code is unchanged, except for some changes to config.py. 

I'm going to improve the `configure` script so that it does slightly smarter detection of the machine that it's on and then sets up the appropriate link to a file from `proteusConfig`.  

Note that you'll need https://github.com/hashdist/hashstack/pull/122 to test this out, and that you should build it with something like:

```
PROTEUS_ARCH=garnet.gnu make
```

I've also found that setting 

```
build_temp: /var/tmp
```

in `~/.hashdist/config.yaml` can improve the performance of builds a bit.