modified baseCheck.f from @mjberger, fixes bug observed in geoclaw run where level 6 was not properly nested, and more generally seen with bounds check turned on
Merge pull request #91 from rjleveque/baseCheck

fix baseCheck.f bug
changed default library routines b4step, setaux, qinit, setprob, src from .f to .f90 files, and fixed all Makefiles in tests and examples
changed double precision to real(kind=8)
changed regression tests in examples/ to use new code in clawutil
added setplot.py to 3d examples that creates empty _plots directory for now
Merge pull request #92 from rjleveque/default-files-f90

Changed default library files to f90 and added regression tests
Merge remote-tracking branch 'clawpack/master' into add-setaux-flag-mask

Conflicts:
	examples/burgers_2d_square/Makefile
	examples/euler_2d_quadrants/Makefile
	src/2d/setaux.f90
	src/3d/setaux.f90