[petsc-dev] snes_type test

[Mark Adams]

I just want to check the interpretation of snes_type test. Is this pretty
conclusively good?

Testing hand-coded Jacobian, if the ratio is
O(1.e-8), the hand-coded Jacobian is probably correct.
Run with -snes_test_display to show difference
of hand-coded and finite difference Jacobian.
Norm of matrix ratio 1.38299e-16, difference 1.11738 (user-defined state)
Norm of matrix ratio 9.50529e-09, difference 7.67972e+07 (constant state
-1.0)
Norm of matrix ratio 1.07438e-08, difference 8.68036e+07 (constant state
1.0)
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