interfacing libpano and numpy

Hi group!

I'm doing some work on hugin's python interface, in the course of which I have experimentally introduced
some code into libpano which might you might find interesting. I've described what I've done in

http://groups.google.com/group/hugin-ptx/browse_thread/thread/19b059cf02bb3b6b#

I think that there might be more code in libpano which would benefit from vectorization. The coding
involved isn't a big deal, but the performance gains can be substantial. My proposed new routine would
live in math.c:

// KFJ 2011-11-23
// this function transforms many coordinates at once.
// The coordinates to be transformed are passed via the pointers
// x_dest and y_dest, and the result of the transformation is
// stored in the memory pointed to by x_src and y_src.
// all vectors have to have space for count doubles.
// Memory pointed to by x_dest and y_dest will only be
// read, not written to.
// params points to a stack of fDesc structures, which
// defines the order, type and additional parameters
// of the partial transformations.

int v_execute_stack_new ( double* x_dest, // x coordinates destination
                          double* y_dest, // y coordinates destination
                          double* x_src,  // x coordinates source
                          double* y_src,  // y coordinates source
                          int count,      // number of coordinates
                          void* params )  // pointer to vector of fDesc
{