* Add a variable that ogcm can output.

commit 7bc43bd15bca6a4204adbe866ff280562a04606c
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Wed Dec 4 13:57:23 2013 +0900

    * Finish implementing a function to output baroclinic pressure.

commit 425d7afeabdd536250bed5fe0822021b357c5139
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Wed Dec 4 01:04:45 2013 +0900

    * Add a module to calculate some diagnostic variables.

commit afef6f0266762b6ed76384f8ce399a9381d0c4f4
Author: Yuta Kawai <ykawai@gfd-dennou.org>
Date:   Wed Dec 4 00:33:53 2013 +0900

    * Add some code to output baroclinic pressure.