Vectorization for lsst 141006

I have modified the pal.pyx.in file to declare versions of existing routines that accept batches of objects and loop over them in the cython (rather than forcing the user to loop over the objects in pure python).

This can result in a significant speed-up for calculations done on large catalogs of objects.  Specifically, it would be very useful for the LSST catalog simulations group.  We use PALPY for our astrometric calculations and would like to be able to quickly run these calculations on tens or hundreds of thousands of objects.

Let me know what you think.

Thank you,

-- Scott Daniel