perform static analysis

Matt suggested

> ```
>  It would be nice to come up with a tree of called functions and 
>  dependencies -- I think  there are quite a few completely unused 
>  functions, and lots of commented out code blocks.   These should
>  all be removed - they exist in the initial git commit, so are not
>  lost to history, but there's no reason to have to look at that.
> ```
