doc: update instructions for Python

python: switch from manylinux2014 to manylinux2010 (for older pip/machines)

python: use default MARCHFLAG for build; set -march=generic for wheels

Suggested-by: Lisandro Dalcin <dalcinl@gmail.com>

python: install libceed.so and headers with Python; make wheels

* Install libceed.so and obtain at run-time via $ORIGIN
* Updates some nonconforming package metadata
* Use Docker with cache for buil

python: install libceed.so and headers with Python; make wheels

* Install libceed.so and obtain at run-time via $ORIGIN
* Updates some nonconforming package metadata
* Use Docker with cache for building manylinux2014 wheels
* qfunction extensions don't call libceed.so directly; can get include
path from libceed module

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python tests: replace hard-coded 1E-14 with TOL based on machine epsilon

Merge pull request #486 from CEED/jeremy/ceed-view

Ceed - add CeedView()

Ceed - add CeedView()

Merge pull request #484 from CEED/valeria/doc-fixes

Doc fixes

User manual: Small wording changes

Merge branch 'valeria/doc-fixes' of github.com:CEED/libCEED into valeria/doc-fixes

AUTHORS: trim by significance and explain rationale

User manual: Update Contributing authorship roles

doc: aligned environment not needed for one-line eq

User manual: Add weak formulations of Mass and Laplace problems

User manual: Add Gallery of QFunctions and small consistency improvements

User manual: style

User manual: Fix aligned equation in BPs on the cubed-sphere. Reported-by @LeilaGhaffari

This fix was necessary after the Mathjax -> KaTeX change

User manual: style

Merge pull request #483 from CEED/jeremy/cuda-gen-multi-emode-out

CUDA - enable multiple output modes for cuda/gen

CUDA - enable multiple output modes for cuda/gen

Add VLA support for CUDA backends (#481)

* CUDA - add VLA support for CUDA backends

* Navier-Stokes - guard #include math.h for CUDA

* Navier-Stokes - fix struct definitions for code generatio

Add VLA support for CUDA backends (#481)

* CUDA - add VLA support for CUDA backends

* Navier-Stokes - guard #include math.h for CUDA

* Navier-Stokes - fix struct definitions for code generation

* Navier-Stokes - fix file location of mass QFunction

* Navier-Stokes - minor style consistency

* Navier-Stokes - more context sturct fixing

* Navier-Stokes - cast context to stop CUDA errors

* Navier-Stokes - change helper functions to inline to silence CUDA errors

* CUDA - clean up CEED_Q_VLA definition for cuda/gen

* Navier-Stokes - populate TODOs for undocumenced functions

* Doc - document libCEED macros

* CUDA - use -default-device for NVRTC

* Tests - add t507 to test VLA support

* CUDA - fix my bug in dim, Q1d for cuda/gen

* Tests - update tap/junit to reflect current CUDA capabilities

* make style

* CUDA - check output bases for dim, Q1d as well (this fixes multigrid example support)

* CUDA - fix readSliceQuads, not all arguments were defined

* Navier-Stokes - document all functions in Navier-Stokes QFunction files

* make style

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Merge pull request #482 from CEED/leila/doc_NS

Leila/doc ns

doc: note about double and single dot contraction added to FEMtheory

doc: explain implicit time integration for NS

doc: few spelling errors fixed