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Hypre solver eliminate boundaries (Redux)#3439

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bendudson wants to merge 4 commits into
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next-elimBE-new
Open

Hypre solver eliminate boundaries (Redux)#3439
bendudson wants to merge 4 commits into
nextfrom
next-elimBE-new

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Aims to import hypre convergence by eliminating boundary rows.

Previously merged in #3082 and reverted in #3136 because it failed round-trip tests.

The vector should be assembled once after importing values.
Assembling twice with elimBE over-corrects the RHS.
row_indexes is free'd using HypreFree, so should be allocated using
HypreMalloc.
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