Switched from parallel stereo to regular stereo to find pixel pairs
Added startup check for dependencies on PATH
Include iomanip header

That header was probably brought in originally by a VW header. I've
been refactor headers in attempt to reduce our includes and eventually
hope to speed up our compile times. Rule of thumb for the future, if
you use it, it is your responsibility to include it.
Add boost, isis3, and cspice to link requirements
Replace libcsparse with cxparse and remove cerbla (not needed)

Libcxsparse is what is provided with base_system
Have CMake use Ceres paths from install location and not src

That paths previously for Ceres looked like paths that were linking to
temporaries from the build in source.