Previously, changing a duplicate_consistency file would be
considered a 'global' change, resulting in CI re-running all tests
for all schemes.

Schedules circleci builds with RUN_SLOW

Be more selective in test runs

Also specifies an order on the PQCLEAN builds to limit fruitless
testing.

Move secret key length back to scheme-level META

This way we can properly raise skiptest

Slow tests

Add -O3 to CFLAGS

Add NIST KAT check for KEMs

Write up some lines about some consumers

[skip ci]

[skip ci]

Fix problems in the NTRU source code

[ci skip]

Clean up some aspects of the tests and made NTRU-HPS code files not executable.