changing MatSetUp()

[Lisandro Dalcin]

After greping, it seems that MatSetUp() is not used in all 'petsc-dev'
repo. If there is no objections (Barry?), I will change it (by
reverting inner calls order) to do the following:

PetscErrorCode MatSetUp(Mat A)
{
  MatSetFromOptions(A);
  MatSetUpPreallocation(A);
}

As I mailed some time ago, there is no point of calling
MatSetUpPreallocation() if the matrix type was not set.


-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
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