rstr - support different at point e-layouts

Merge pull request #1537 from CEED/jeremy/pragma-once

Use #pragma once for non-JiT headers

minor - update copyright headers

headers - use #pragma once for non-JiT headers

Merge pull request #1521 from CEED/jeremy/cov-fixes

Reduce Code Duplication

backend - use new user data copy utility

Merge pull request #1505 from CEED/jeremy/return-ceed

Add Ceed*ReturnCeed

interface - add Ceed*ReturnCeed

Merge pull request #1488 from CEED/jeremy/const-path

Const for CeedQFunctionGetSourcePath

internal: const for source paths

Add const to CeedQFunctionLoadSourceToBuffer output argument. If we
had Result, this would look like

let const source_buffer = CeedQFunctionLoadSourceToBuffer()?;

internal: const for source paths

Add const to CeedQFunctionLoadSourceToBuffer output argument. If we
had Result, this would look like

let const source_buffer = CeedQFunctionLoadSourceToBuffer()?;

The caller is free to cast in the const when passing the output variable
if they want this semantic:

let mut source_buffer = CeedQFunctionLoadSourceToBuffer()?;

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internal - const for CeedQFunctionGetSourcePath

Merge pull request #1487 from CEED/jeremy/field-name-const

Add const to GetName functions

backend - add const to QF name acessor

Merge pull request #1483 from CEED/jeremy/use-getters

Reduce reaching into private data

internal - reduce reaching into private structs

Merge pull request #1476 from CEED/jeremy/gpu-fallback

Fallback from GPU gen to shared for non-tensor

op - add CeedOperatorHasTensorBases

Merge pull request #1463 from CEED/jeremy/memcheck-strides

CEED_STRIDES_BACKEND related updates

rstr - fix signature of GetLayout

rstr - add CeedElemRestriction[Get,Set]LLayout

CeedMatrixPseudoinverse utility function (#1251)

* Added CeedMatrixPseudoinverse utility and use it CeedBasisGetCollocatedGrad

* Used pseudoinverse utility in CeedBasisApplyAtPoints

* Update d

CeedMatrixPseudoinverse utility function (#1251)

* Added CeedMatrixPseudoinverse utility and use it CeedBasisGetCollocatedGrad

* Used pseudoinverse utility in CeedBasisApplyAtPoints

* Update description of CeedMatrixPseudoinverse function

Co-authored-by: Jeremy L Thompson <jeremy@jeremylt.org>

* Used pseudoinverse utility in CeedBasisCreateProjectionMatrices

* Updated inline comments

* Added inline comment

* Round matrix-matrix product to zero in CeedBasisCreateProjectionMatrices

* increased tolerance in ex1-volume/src/main.rs

---------

Co-authored-by: Jeremy L Thompson <jeremy@jeremylt.org>

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Merge pull request #1302 from CEED/sjg/gpu-restriction-dev

GPU element restriction for `CEED_RESTRICTION_ORIENTED` and `CEED_RESTRICTION_CURL_ORIENTED`

Operator full assembly and diagonal assembly for cuda-ref and hip-ref backends for H(div) and H(curl) elements

Merge pull request #1431 from CEED/sjg/strict-prototypes-fix

Silence compiler warning for `-Wstrict-prototypes`

Fix comment