Merge pull request #46 from gradylemoine/master

3D parameter checking and defaults
changed environment variable CLAWUTIL to CLAW/clawutil
Changed Makefile.common to reset FC=gfortran if make sets it to f77.  Addresses issue #45.
Merge pull request #47 from rjleveque/env-vars

Fixed Makefile.common for FC=f77 problem and fixed some environment variables.
Removed deprecated data.py file, will replace by current clawdata.py
Renamed clawdata.py to data.py...
setrun files should now say 'from clawpack.clawutil import data'
and 'rundata = data.ClawRunData(...)'
removed oldclawdata.py, seems to be ancient by now
removed deprecated make_clawtop.sh script
fixed setrun template in conversion tools
Merge pull request #48 from rjleveque/clawdata

Change module name `clawdata` to `data`.