Added functionality to handle physical boundary conditions.  Still need routine 'get_phys_boundary' to determine when a patch edge intersects a physical boundary.
Added functionality to handle physical boundary conditions.  Still need routine
'get_phys_boundary' to determine when a patch edge intersects a physical boundary.

ForestClaw/forestclaw,ForestClaw/forestclaw,ForestClaw/forestclaw,ForestClaw/forestclaw,ForestClaw/forestclaw,ForestClaw/forestclaw