PETSc - remove extra memcpy in Multigrid example

Basis - drop BasisGetValue in favor of BasisGetInterp/Grad

Operator - move AssembleDiagonal to fallback

Style - rename files vec->vector for consistency

Ref - small restriction changes

Ref - use CeedPragmaSIMD in rstr

Ref - make ncomp const for rstr as well

Ref - make restriction block size const

Operator - provide default impl of Composite Operators

Operator - Add OperatorApplyAdd, implement for CPU, OCCA backends

Delegate AssembleLinearQF to ref/serial when not impl (#406)

* Operator - delegate AssembleLinearQF to ref/serial when not impl by backend

* Occa - Fix restriction summing error

* Tests - fix

Delegate AssembleLinearQF to ref/serial when not impl (#406)

* Operator - delegate AssembleLinearQF to ref/serial when not impl by backend

* Occa - Fix restriction summing error

* Tests - fix error in t534-f qfunction for CPU

* make style

* Operator - clarify fallback mechanism, allow backends to provide fallback other than /cpu/self/ref/serial

* Operator - update fallback to avoid copying vectors, restrictions

* Operator - move fallback to ceed level

* Operator - explicitly check for falling back to onself

* Update interface/ceed-operator.c

Co-Authored-By: Jed Brown <jed@jedbrown.org>

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Basis - Use CEED_VECTOR_NONE for EVAL_MODE_WEIGHT

CPU - clean up qvecsout via increasing references

CPU - update identity qf assemby error message

make sytle

QFunction - Refactor CreateIdentity to include inmode and outmode

CPU - avoid extra memcpy for identity qfunctions

QFunction - use CeedQFunctionUser for CeedQFunctionGetUserFunction

make style

Style - Fix indentation errors

Style - fix array pointer and function arg style

CPU - fix collocated basis grad error

Make tidy

Make style

LCOV - minor updates