Restore the error checking code

Add a ScatterMode arg in cuda vecscat to select to/from context

The old code VecScatterInitializeForGPU() initializes the pointer (PetscCUDAIndices*)&inctx->spptr) based
on an input ScatterMode befo

Add a ScatterMode arg in cuda vecscat to select to/from context

The old code VecScatterInitializeForGPU() initializes the pointer (PetscCUDAIndices*)&inctx->spptr) based
on an input ScatterMode before VecScatterBegin() is called.

If a vecscatter context is firstly used for a SCATTER_FORWARD, and secondly used
for a SCATTER_REVERSE, there will be an error. Since in the second VecScatter,
it uses out-of-date (PetscCUDAIndices*)&inctx->spptr)

The solution is "do not prematurely consider ScatterMode when building (PetscCUDAIndices*)&inctx->spptr). Instead,
select correct to/from until VecScatterBegin() is called"

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Merge branch 'barry/have-veccuda-to-have-cuda'

Change outdated HAVE_VECCUDA macro to simply HAVE_CUDA for clarity/ease of maintenance.

Commit-type: style-fix

Remove commented out incorrect dead code

Commit-type: style-fix
Reported-by: Matthew Knepley <knepley@gmail.com>

Make MPI GAMG work with mpiaijcusparse matrices.

Note this doesn't require changes to GAMG code, just code that GAMG uses so they can handle the mpiaijcusparse subclass

Commit-type: feature
Reporte

Make MPI GAMG work with mpiaijcusparse matrices.

Note this doesn't require changes to GAMG code, just code that GAMG uses so they can handle the mpiaijcusparse subclass

Commit-type: feature
Reported-by: Brian Van Straalen <bvstraalen@lbl.gov>

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MatSetFromOptions_XXX: fix help output

Calling PetscOptionsBegin inside the specific implementations
turns off the output of the available options. Close the options with PetscOptionsTail() as elsew

MatSetFromOptions_XXX: fix help output

Calling PetscOptionsBegin inside the specific implementations
turns off the output of the available options. Close the options with PetscOptionsTail() as elsewhere in PETSc

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Mat: add slot for defaultvectype

Remove duplicated code for MatCreateVecs_XXX that can take advantage of the new defaultvectype variable