[petsc-dev] pushing MASSIVE change to PETSc-dev

[Jed Brown]

One consequence of this change is that, in general, it should no longer be
necessary to use the construct

if (x->y) {ierr = YDestroy(x->y);CHKERRQ(ierr)}

Instead, you should be able to always use

ierr = YDestroy(&x->y);CHKERRQ(ierr);

There are still some of the former around, but it should not be used in new
code.
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