Fix dummy argument aliasing issue

NAG version 6.2 catches a problem with passing the same variable to two
different arguments of a subroutine, one of which is intent(out). The
fix is to use a separate copy of the local variable for one of the
arguments.

Fixes #6

Version for CISM2.1 GMD paper

Compared to the last tag, major changes in this tag are:

- Allow more characters in message string

- Added a depth-dependent bmlt_float option

Revert to previous hybrid gradient scheme

In a recent commit (89f6875), the hybrid gradient scheme was modified
to compute gradients at edges where an ice-covered land cell sits above
ice-free ocean. This commit reverts to the earlier rule that gradients
are set to zero where an ice-covered land sits above ice-free
ocean. Instead of computing a nonzero gradient, we compute a lateral
spreading term at these edges, assuming that the margin is a
marine-based cliff. Answer changes are modest, but generally reduce max
speeds at coastal margins and promote greater stability.

Initial tag of CISM2.1 release

Rework test case scripts and directory structure for compatability wi…

…th LIVV.

Bug fixes:

* Set bflx to 0 when computed value is very close to 0 - avoids potential erroneous change in bed temperature.
* Fix incorrect indexing of arrays passed to glissade_calcpmpt(), which resulted in incorrect values for the pressure melting point temperature in the column.

Bug fixes

  removed DNO_RESCALE from Fortran compiler lines in a few builds scripts where causing errors
  replaced GLIMMER_ prefix in a few builds scripts with newer CISM_ prefix

Bug fix:

add 'output' and 'scratch' dirs to ISMIP-HOM test case

Bug fixes:

      Fix bug in ocean penetration parameterization
      Add stop to parallel_slap.F90 parallel_stop()
      Adding empty directory to Ross test case

CISM Version 2.0

First public release of CISM with parallel, higher-order dynamical core.