PetscViewerCreate_XXX() and PetscViewerFileSetName_XXX() should not change format or iformat
Merge branch 'barry/fix-viewer-format-secret-change' of bitbucket:petsc/petsc

* 'barry/fix-viewer-format-secret-change' of bitbucket:petsc/petsc:
  PetscViewerCreate_XXX() and PetscViewerFileSetName_XXX() should not change format or iformat