Hypre matrix reader fixes

[pazner]

This PR has some small fixes and changes to HypreParMatrix. In particular, it fixes an issue with HypreParMatrix::Read_IJMatrix not setting up the MemoryIJData properly.

Specific changes:

• Use WrapHypreParCSRMatrix in HypreParMatrix::Read and HypreParMatrix::Read_IJMatrix (bug fix)
• Clarify the documentation that files saved with HypreParMatrix::Print should be read with HypreParMatrix::Read_IJMatrix
• More robust check for diagonal blocks in HypreParMatrix constructor
• Use const std::string& instead of const char* in some Hypre APIs

PR	Author	Editor	Reviewers	Assignment	Approval	Merge
#4310	@pazner	@tzanio	@tzanio + @v-dobrev	5/16/24	5/17/24	5/20/24

PR Checklist

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[v-dobrev]

It is best to MPI_Allreduce this value with logical AND, i.e. this Boolean means that the partitionings are globally equal -- this way all ranks will make the same decisions in the following code.

[pazner]

OK, done in 8be0dee.

[v-dobrev]

The logic for only comparing the rows and cols partitionings as pointers is used in other places too, I think. It's probably best to factor out the full comparison algorithm and use it everywhere.

[pazner]

The logic for only comparing the rows and cols partitionings as pointers is used in other places too, I think. It's probably best to factor out the full comparison algorithm and use it everywhere.

I did this in 8da512d. The logic for computing the size of the partitioning arrays was also repeated in a couple places, there is now a helper function GetPartitioningArraySize to do this.

[tzanio]

This PR is now under review (see the table in the PR description). To help with the review process, please do not force push to the branch.

[tzanio]

Thanks @pazner !

[liruipeng]

Looks good to me. Thanks @pazner

[pazner]

Looks good to me. Thanks @pazner

Thanks, @liruipeng. BTW, is there any update on hypre-space/hypre#168? Is hypre_ParCSRMatrixReadIJ essentially deprecated?

[tzanio]

Merged in next for testing...