Added land_surface__elevation as an output var.
Dynamically allocate memory for some grids.

Changed
-------
* Dynamically allocate memory for the following grids:
  - Topography
  - ShelfDepth
  - Hsig
  - Dir
  Memory is allocated in cem_initialize and freed in cem_finalize.
Turned off SWAN.
Merge branch 'master' of github.com:plimber/cem

Conflicts:
	globals.h
Changed floats to doubles for global variables.