add ones and exact keyword options to math.grid.randomly_bin;
lattice solver now takes same nbins as LatticeSolver (defaults to 2**ndim)


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/mystic/mystic@769 968178ea-60bd-409e-af13-df8a517b6005
using the faster numpy.product versus numpy.prod


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/mystic/mystic@770 968178ea-60bd-409e-af13-df8a517b6005
Merge branch 'master' of https://github.com/uqfoundation/mystic