* Add available boundary conditions for potential temperature, such as first, second-type and relaxed-type.
* Modify some interfaces which call subroutines to perform explict or implicit time integration of hydrostaic bousinessq equation.

commit d690b1977da2ed770be2dd939d2690f7666b008d
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Wed Aug 13 11:52:10 2014 +0900

    * Add available boundary conditions for potential temperature, such as first, second-type and relaxed-type.

commit 4e52d3ed210daa0d4f10446c7b14d6cc60754c95
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Tue Aug 12 21:02:08 2014 +0900

    * Modify some subroutines associated with applying the vertical boundary conditions
      to implement more complicated boundary conditions.

commit 988b00e1a24ee87f36fe32ed342940501b04f077
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Tue Aug 12 11:46:48 2014 +0900

    * Remove some prototype modules used in implementing HydroBouEq_TimeInteg_mod.f90.

commit 75f543b8383fad4d2858a753c18e4d949a056fbe
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Tue Aug 12 11:43:56 2014 +0900

    * Modify the interfaces in some modules.

commit 69cb8513a73134cafd7d4b5c4b08c5c24157f007
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Tue Aug 12 11:39:44 2014 +0900

    * Add a module which manages an implicit process of the temporal integration
      of hydrostatic boussinesq equation.
      HydroBouEqSolverVDiffProc_mod.f90 will be replaced with this module.

commit 19f6700c012a51211a248d80f4574bf7809cb0b5
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Tue Aug 12 11:26:04 2014 +0900

    * Rewrite a module which provides a temporal integration of hydrostatic boussinesq equation by the method of lines.                                                                               In this module, some temporal schemes are available.

commit 7d88d3769a5ef382bc9941c15834cf6c5e17f3d9
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Mon Jul 28 20:56:16 2014 +0900

    * Move some declarations for the id or label of a temporal scheme.

commit 5dee2888cfee0808c8c7e78a01fec75125c80a39
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Mon Jul 28 16:41:03 2014 +0900

    * Split a module implemented a solver for hydrostatic bousinessq equation into two modules.
      The two modules contain the part of explicit and implicit temporal integration respectivly.