Initial slapdash Cython-accelerated MUSIC estimator.  Not yet tested.
Propogation vector should be in opposite direction of AoA.
It works! (Mostly, I think.) Doasearch not yet implemented. Need to
normalize output image.
Removed debugging print statements in awkward places, including an ugly
giant comment
Fixed steering matrix calculation: it actually works now.  The cython
implementation is also working.  Improved tests somewhat.
Normalized output image.
Improved readability, added profiling support flag line to cython lib.
Split Python MUSIC implememntation into separate repo.