Fixed geometry.jou to be consistent with mesh.
Reduced mesh size for quicker runtimes.
Cleanup APREPRO lines in journal files.
Cleanup of journal files.

Move common settings to pylithapp.cfg. Reduce total time to 100*yr.
Changed comments to provide relaxation time.
Refine tolerances and scales.
Small tweaks to tolerances.
Added spatial database to Makefile.am so it will be included in
distributions.
Cleaned up gravity example, and hopefully have stable solution for
finite strain problem. New version uses symmetry and small time step
to stabilize finite strain example.
Modified the README to reflect the new layout of the examples.
Removed old mesh file from Makefile.
Merge branch 'williams/add-examples-grav2d' into maint

* williams/add-examples-grav2d:
  Removed old mesh file from Makefile.
  Modified the README to reflect the new layout of the examples.
  Cleaned up gravity example, and hopefully have stable solution for finite strain problem. New version uses symmetry and small time step to stabilize finite strain example.
  Added spatial database to Makefile.am so it will be included in distributions.
  Small tweaks to tolerances.
  Refine tolerances and scales.
  Changed comments to provide relaxation time.
  Cleanup of journal files.
  Cleanup APREPRO lines in journal files.
  Reduced mesh size for quicker runtimes.
  Fixed geometry.jou to be consistent with mesh.