Add check for small sea surface
Move data classes to geoclaw module

Also moved appropriate parameters in Fortran source.  The bowl-radial
example is not yet working.
Convert to moved data objects
Demo of long-term time integration instability

Primarily modifies the bowl-radial example problem to show the
instability that appears during long time integrations.
Minor tweaks, moving example to tests
Switching to non-monolithic data classes
Add refinement module reference
Failure is failing again
Changed to single step test
Change test for better look