Add aux copy mask to setaux calling sequence
Modify swirl example for aux copy mask
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)
Fix up example for new aux copy mask array
Fix Makefiles to new f90 version of setaux
New f90 and aux copy max setaux template
Modify 3d swirl example for aux copy mask
Modify for aux copy mask capability
Modify 3d interface example for aux copy mask
Update setaux to f90 blank
New setaux template including f90 and aux copy mask
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
Update tests for new setaux interface
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
Merge pull request #93 from mandli/add-setaux-flag-mask

Change `setaux` subroutine interface to include aux copy mask array
Revert "Merge pull request #93 from mandli/add-setaux-flag-mask"

This reverts commit 71e910c8225d515caf19b4725e1305b006ceb7a2, reversing
changes made to ab5e7b17c310acba48da864e117c73ec8e626b2a.

We decided there is a better way to flag aux arrays by using aux(1,i,j) for
the flag instead of introducing a new array aux_copy_mask.

For now, revert this commit and leave code alone for 5.0.0 and then add the
flagging to 5.1, without needing to change the calling sequence of setaux.
Merge pull request #95 from rjleveque/revert-setaux-flag-mask

Revert "Merge pull request #93 from mandli/add-setaux-flag-mask"