Dies in gfixup with mptr=0. Version with debugging statements.  Dies with or without call to topo_update.
added test dtopo file dtopo3.tt1
fixed gfixup bug -- need to skip setting time and calling topo_update when mptr==0
Merge pull request #64 from rjleveque/new_dtopo

New dtopo
added gauge plots, adjusted tfinal in dtopo1 test problem
Removed dev_new_dtopo directory with code for testing new_dtopo.  One example will be added to tests/ once the topotools are fixed up.
Merge pull request #65 from rjleveque/new_dtopo

Cleaned up new_dtopo branch