Implementation of a method for calculating van der Waals energies based on the idea of density decomposition. For theoretical details, please see the following publication and references therein: Lampros Andrinopoulos, Nicholas D. M. Hine and Arash A. Mostofi, Calculating dispersion interactions using maximally localized Wannier functions, J. Chem. Phys. 135, 154105 (2011). For further details of this program, please see the documentation in /doc and the related examples in /examples. (c) 2012, L Andrinopoulos, NDM Hine, AA Mostofi