Adding empty directory to Ross test case

This fixes a fatal error in the runRoss python script that expects the
'output' directory to exist
Add stop to parallel_slap.F90 parallel_stop()

When running the serial code and there is a fatal error, the code does
not actually abort. There is a call to parallel_stop, but in the
parallel_slap version of this subroutine the stop is commented out.
This commit uncomments the stop.
Fix ocean penetration bug

* There were scaling errors and typos in the equations for the ocean penetration
basal_water option - those are fixed.
* Adding deallocate routines to the effective pressure arrays (were missing)
* other minor cleanup, including switching from stagthickness to glissade_stagger for effecpress
Merge branch 'bugfix/v2.0.1'

* bugfix/v2.0.1:
  Fix ocean penetration bug
  Add stop to parallel_slap.F90 parallel_stop()
  Adding empty directory to Ross test case