Sweeping changes

Produced working version of the FiniteDifferenceSolver using the MTJ
Lapack interface. Appears to produce solutions quickly; time < .3 sec
for a 1000 point grid when requesting 5 eigvals. Test showed good
convergence in both the eigenvalues and eigenvectors toward their
expected theoretical values for the harmonic well.

The Function interface has been expanded to include normalization.

Former shooting method remnants have been removed.

Also, our custom, in-house approach to finite differences has been wiped
from this branch as it belongs in its own branch.