doc: separate Doxygen groups by Public API/Backend API/Internal Functions

Helped-by: Valeria Barra <valeriabarra21@gmail.com>
Squashed-by: Jed Brown <jed@jedbrown.org>

Interface - update constants to be const...ant

ElemRestriction - make strides const

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

ElemRestriction - add CEED_ELEMRESTRICTION_NONE so we can stop making dummy restrictions for CEED_EVAL_WEIGHT fields

Make style

Restriction - add CEED_STRIDES_BACKEND

Restriction - replace identity restrictions with strided restrictions

Merge branch 'jed/ns-dmplex' [PR #458]

* jed/ns-dmplex: (73 commits)
NS: remove density_current_primitive (still work in progress)
Remove a bunch of unused variables and update doc
Update READ

Merge branch 'jed/ns-dmplex' [PR #458]

* jed/ns-dmplex: (73 commits)
NS: remove density_current_primitive (still work in progress)
Remove a bunch of unused variables and update doc
Update README: remove density_current_primitive problem option for now
Use const in VLA declaration casts to suppress icc warning also in densitycurrent_primitive
Remove a bunch of unused or double-declared variables
Update README
NS: use const in VLA casts to suppress icc warning
NS: add command-line support for specifying DC center/axis
NS: return to insulated no-slip walls instead of full-Dirichlet
NS: remove dead code for scaling VTK output back to dimensional units
NS: add support for free slip wall boundary conditions
NS density_current: remove redundant initial/boundary condition and trailing whitespace
Some changes in documentation
Update top-level README
Update examples/README
Update examples/navier-stokes/README
Update .gitignore
Update documentation
Initialize *problem pointer as NULL
NS: move nsplex.c to navierstokes.c
...

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ElemRestriction - make lmode a separate enum

ElemRestriction - remove lmode from backend apply signature

ElemRestriction - move lmode to constructor over apply

Vector - add CeedVectorNorm

Restriction - add lmode to ElemRestrictionGetMultiplicity

Basis - update documentation for CeedMatrixMultiply

Operator - Switch CreateFDMElementInverse to fallback mechanism

Basis - drop BasisGetValue in favor of BasisGetInterp/Grad

Style - fix comment character in ceed.h

Promote CeedElemRestrictionGet* to public interface

These were formerly backend-only, but their availability can help
users write reliable code without needing to pass around redundant
numeric value

Promote CeedElemRestrictionGet* to public interface

These were formerly backend-only, but their availability can help
users write reliable code without needing to pass around redundant
numeric values.

show more ...

CeedElemRestrictionGetMultiplicity: move TransposeMode to an input arg

Enables support for interlaced (CEED_TRANSPOSE), as typically used in
PETSc examples/apps.

Merge pull request #372 from CEED/jeremy/element-fdm-inv

FDM Element Inverse

Ceed - Define CEED_EPSILON for interface use

make style

Ceed - use 'simd' for Intel

Operator - Add CreateElementFDMInverse

Merge pull request #423 from CEED/jeremy/small-fixes

Small fixes from Python Work