basis - refactor Chebyshev interp creation to separate fn

basis - ApplyAtPoints should take number of elem

rstr - transpose AtPoints restriction fixes

rstr - minor naming fix

rstr - allow backends to add padding to AtPoints E-vec

rstr - support different at point e-layouts

fix: Correct docstring, make parameter name consistent

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all sin

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all singly included headers

* jit - drop most guards on backend JiT files

* sycl - drop extra header guards

* jit - enable #pragma once for QF source

* fluids - use #pragma once for util/helper qf source

* test - check different multiple includes

* fluids - fix odd include

* jit - update interface for building JiT string from multiple files

show more ...

minor - update copyright headers

headers - use #pragma once for non-JiT headers

backend - use new user data copy utility

interface - add Ceed*ReturnCeed

sycl: resolve const variance

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()?;

show more ...

internal - const for CeedQFunctionGetSourcePath

backend - add const to QF name acessor

interface - add const to GetName functions

qf/op - add QFunction/OperatorFieldGetData

internal - reduce reaching into private structs

Add `CeedOperatorIsAtPoints`

op - add CeedOperatorHasTensorBases

rstr - use CeedSize for vec len checks

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