* Modify the unit test for HydroVDiffProc_mod.f90.
  * A diffusion matrix  is checked for various boundary conditions.

* Change the treatment of coefficients to distinguish between
  eddy viscocity and diffusion cofficents.

* Implement a subroutine to provide horizontal and vertical hyper diffusions.

* Implement new subroutines to provide the conversion between real and chebyshev spectral data.

* Perform the numerical experiment of wind-driven circulation again
  and update a report of the result.
  * Add vertical diffusion of basic potential temperature field.

commit 8abe538a2d658a332e711c2562ac4bcbdb20b0e9
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Fri Mar 28 17:02:59 2014 +0900

    * Modify some Makefile.am files.

commit f4920bdb47dd48917dadcf90f09aea40144256a6
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Thu Mar 27 13:48:18 2014 +0900

    * Commit for Kawai work-semi.

commit 764bc87ea93416cc70ce0d58cfea7f48826414df
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Wed Mar 19 15:38:59 2014 +0900

    * Add a few test cases to check a 1D diffusion matrix with inhomogeneous boundary conditions
      in HydroBouEqVDiffPoc_mod_test.f90.