Adding madpy

This is a pull request to add madpy, a one-dimensional python implementation of MADNESS, to the main MADNESS repository.  madpy is intended primarily for pedagogical use in understanding how MADNESS works.  It could also be useful as a development prototyping laboratory.

For newcomers to MADNESS, working first in madpy can help demonstrate concepts in wavelet decomposition and multi-resolution analysis before diving into the C++ implementation.