doc: add developer notes on shape and adopt convention

Tensor/matrix shapes are now consistently described using a
lexicographic convention in the documentation. Further details on the
convention i

doc: add developer notes on shape and adopt convention

Tensor/matrix shapes are now consistently described using a
lexicographic convention in the documentation. Further details on the
convention is described in new developer notes. I did not change
comments in backends/{occa,magma} because there is outstanding
development that may interfere with merging.

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Standardize CeedIntPow and CeedIntMin

Documentation updating for t500

Move ceed* files to 'inteface' directory, comment cleanup

Further CPU backend commenting and cleaning

Clean up and tighten Opt and Ref backends

8x vectorization for Opt

Comment update, remove unneeded guard on VectorDestroy

Create RestrictionCreateIdentity, convert examples, simplify OperaterApply

Merge branch 'batched-basis-apply' [PR #110]

* batched-basis-apply:
Style and documentation updates
Error message for BasisApply when nelem != 1
Add nelem argument to BasisApply

Style and documentation updates

Merge branch 'RestrictionBatch' [PR #106]

* RestrictionBatch:
Clean up/reorder blocked loop
Update loops
Style
More loop tightening
Tighten loop structure for permute and pad
Document nc

Merge branch 'RestrictionBatch' [PR #106]

* RestrictionBatch:
Clean up/reorder blocked loop
Update loops
Style
More loop tightening
Tighten loop structure for permute and pad
Document ncomp (description/name ndof is incorrect)
Documentation update
Loop and style updates
Tap exception for backends that don't yet support Blocked restriction
Added RestrictionCreateBlocked, only implimented in Ref, and t06

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Clean up/reorder blocked loop

Update loops

Style

More loop tightening

Loop and style updates

Error message for BasisApply when nelem != 1

Add nelem argument to BasisApply

Added RestrictionCreateBlocked, only implimented in Ref, and t06

Remove !! in Operator setup

Move predefined constants from NULL to addr of private static, update backends

[NEK][WIP] Convert bp1 and bp3

Documentation and style updates

[MFEM] Convert MFEM bp1 to active passive