Hvconfounds

Eliminated the 'numpy.linalg.svd' call originating from 'scipy.linalg.svd' by solving the equivalent eigenvalue problem 'scipy.linalg.eigh' of the inner product matrix, staying in the scipy module, and hence increasing stability. This is particularly the case if 'numpy' is not compiled against Lapack, but against Lapack lite.

This solves issue #152.