* Add support for specifying architecture and feature limits

* cpuinfo not supported on ppc

* Detect 32-bit python interpreter on 64-bit CPU

* Fix bugs in isolated tests

* Also support restricting operating system

* Enable valgrind exit errorcode

It seems we were not doing anything with the valgrind results... D:

* Use --exit-on-first-error if available

* Revert "Merge pull request #182 from PQClean/rainbow"

This reverts commit 8a008417fe988b48c8acc4aefc9c299a4d3c1645, reversing
changes made to d4b612fe9a.

update LEDA to v2.1

Run KEMs and SIGs as separate CI jobs

Use Python's built-in ``diflib`` to compute diffs between the two versions.

They are beginning to block the pipeline for too long.

[ci skip]

* Reduce pytest xml log size
* store artifact to debug
* Fix test result path

Fix SPHINCS+ clang-tidy warnings.

Reduce the number of test runs for Valgrind tests

Disable clang-tidy on i386

Fixed some buffer handling bugs that should never happen in practice

Add abstract state duplication for SHA256 incremental hashing API

This should drastically reduce the runtime of the valgrind tests

* Do tests with pytest to run them in parallel

* attempt to handle merge commits better for PR test path

Similar to how we solved this for travis

* Clean up imports

* don't run valgrind if not specified slow_test

* Fix functest after initializer rename

* upload tests results as junit

* Upload test-common files since #200 got merged

* Catch test results upload failure

* Move test support files into tests directory

* Fix common tests dir in test

* Fix Windows Makefile for common tests

* notrandombytes.obj should be in TEST_COMMON_DIR

Create SECURITY.md

Fix documentation for Dilithium `crypto_sign_open`

Only absorb root part of pk in haraka message hashing.

Add Rainbow

Falcon implementations (integer-only code, constant-time).

Uses the new Gitlab security documenting features/"standard" to explain our security non-policy.

It mentioned `sk` instead of `pk` as specified in the arguments.

Closes #205.