Added a class for creating "realified" Fourier transforms.  So instead of complex-coefficient matrices, it uses a realification of said matrices.  This will be easier to use in the real-coefficient-based problem.
Added a class for creating "realified" Fourier transforms.  So instead of complex-coefficient matrices, it uses a realification of said matrices.  This will be easier to use in the real-coefficient-based problem.

vdods/heisenberg,vdods/heisenberg