Add math/octave-forge-ad port.
This package is "Automatic Forward Differentiation (AD)".
The octave-forge package is the result of The GNU Octave Repositry project,
which is intended to be a central location for custom scripts, functions and
extensions for GNU Octave. contains the source for all the functions plus
build and install scripts.
PR: 127030
Submitted by: Stephen Montgomery-Smith <stephen@math.missouri.edu>