Don't null out the fstream if we fail to open file. This is for debugging.
We need to clean up these failure modes at some point, while still
allowing for debugging on other hosts.
Always -g by default. We can add debug vs. release later.
- Changed SConstruct for basic_walk to include -g if platform is intel.
- Wrote callibration loop. Allows you to move the servos around to exact
  locations for each position. (At some point I need to remember these
  values in a config file, but for now I'll just cal at startup. More
  other things to work on first.)