sextractor: new formula

Sextractor is widely used in astronomy for photometry (measuring brightnesses from images). It has been difficult to compile because of its dependence on ATLAS for the linear algebra routines.

The patches in this formula allow it to be compiled against the Accelerate framework instead. I am in email contact with the developer of sextractor about getting the patches incorporated upstream.

Tagging @dstndstn on this because he was also involved in developing the formula.