Tzanio Kolev

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Merged in `next` for testing...

This PR is now [under review](https://github.com/mfem/mfem/blob/master/CONTRIBUTING.md#pull-requests) (see the table in the PR description). To help with the review process, please **do not force push** to the branch.

The reason you can't add entries in the `SparseMatrix` is that it is finalized in `FormLinearSystem`. The [code](https://github.com/mfem/mfem/blob/master/fem/bilinearform.cpp#L832-L899) for `FormLinearSystem` in the serial conforming case (no AMR) and no Hybridization...

This PR is now [under review](https://github.com/mfem/mfem/blob/master/CONTRIBUTING.md#pull-requests) (see the table in the PR description). To help with the review process, please **do not force push** to the branch.

I spoke with @aaronskinner, and he approves

@johnbowen42 -- some CI tests are failing

To clarify: "DOF" here means the numbering of the Mesh nodes (as a high-order grid function), right?

This PR is now [under review](https://github.com/mfem/mfem/blob/master/CONTRIBUTING.md#pull-requests) (see the table in the PR description). To help with the review process, please **do not force push** to the branch.