ref - drop unused variables in OpAtPoints

basis - ApplyAtPoints should take number of elem

style - num_active_* => qf_size_*

cpu - clean up QF assembly memory access

rstr - transpose AtPoints restriction fixes

Update backends/ref/ceed-ref-operator.c

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

Fix bug in diagonal assembly for point operators

tidy - minor fix of unititalized value warning

rstr - minor naming fix

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

cpu - add AssembleAddDiagonal for AtPoints Operator

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 new user data copy utility

backend - same memory owned/borrowed strategy for all impls

ref - simplify GetArrayWrite logic

Fix a few more CeedInt promotions

rst - clarify index checking logic

rstr - use CeedSize as loop itrs for less casting

ref - promote CeedInts when indexing into Evecs

cpu - consistently use SetValue to initalize CeedVectors

cpu - simplify AtPoints scratch vector initalization logic

cpu - clean up stray variable

Move fix to CeedOperatorSetupFieldsAtPoints_Ref

cpu - padd AtPoints evec for memcheck