op - minor performance improvement for op with repeat input rstr

atpoints - remove some extra operations

atpoints - fix diagonal bug with stale qvec data

atPoints - fix diagonal assembly for mixed

gpu - minimum input/output array size of 1

op - cast to CeedSize when creating rstr

op - HIP diagonal assembly AtPoints

hip - add AtPoints CeedOperator

AtPoints - ease memory requirement

AtPoints - fix gpu thread usage

hip - add BasisApplyAtPoints

gpu - skip unneeded restrictions in OpApply

vec - use min of 2 lengths for gpu impl of CopyStrided

hip - fix references to .cu

hip - add Vec*Strided utils

basis: CreateProjection set q_ref, q_weight to NULL

rstr - transpose AtPoints restriction fixes

points - fix gpu conversion to standard indexing for num_comp with rstr AtPoints

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

hip - add ElemRestrictionAtPoints

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

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minor - update copyright headers

backend - use const for backend rstr data, should never change after set

backend - use new user data copy utility

backend - same memory owned/borrowed strategy for all impls