[petsc-dev] PetscLogView with PETSC_VIEWER_ASCII_INDEX et al.

[Jed Brown]

It turns out that if someone puts

  PetscViewerSetFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INDEX);

in their code and forgets to reset the format before PetscFinalize, then
-log_summary will not print.  This was easy enough for me to figure out
with a debugger, but totally perplexing for the application.

We can patch this specific case easily enough, but can we address the
general case where only certain formats should be significant for
different kinds of output?  Opinions?
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