LLSP: linear least squares problem

New OO class have been created:
LLSP - Linear Least Squares Problem.
2 solvers are connected for now: lapack_dgelss and lapack_sgelss (double and single precision). Requires LAPACK and scipy.
A simple example is provided.

Already available in svn and box.net!

P.S. As I had been informed by developers of dgelss/sgelss, they have more powerful routines: dgelsa and dgelsb, available at

www.hpca.uji.es  ->  Software Efforts  -> LS Library

However, they are not included in LAPACK yet.