about viewer formats

[Lisandro Dalcin]

Barry, I saw you commit removing PETSC_VIEWER_BINARY_NATIVE. This
makes me think that PETSC_VIEWER_ASCII_DEFAULT and
PETSC_VIEWER_BINARY_DEFAULT (which is NOT used in sources) are a bit
redundat, Why not to remove both and add a new PETSC_VIEWER_DEFAULT?
Does it make sense?

-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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