Build Errors and Warnings Should be Addressed

There are a ton of warnings and errors during the build from pyflakes, pep8, astyle (?), and gcc/clang. It would improve our ability to find real errors if we addressed things like:

- missing whitespace
- trailing whitespace
- unused variables
- incorrect indentation
- unused imports
- multiple imports (redefinition of unused import)
- comparison of different types

I think @aganders3 addressed some of this by removing `aestyle` as a requirement last year, but there may still be a lot of warnings generated during compilation. The output is still quite long, anyhow.