Merge remote-tracking branch 'origin/master' into masters/weak_mem

.gitattributes

.gitignore

.gitlab-ci.yml

Missing.md

README.md

_CoqProject

theories/lang/lock.v

theories/lang/notation.v

theories/lifetime/at_borrow.v

theories/lifetime/frac_borrow.v

theories/lifetime/lifetime.v

theories/lifetime/lifetime_sig.v

theories/lifetime/meta.v

theories/lifetime/model/accessors.v

theories/lifetime/model/borrow.v

theories/lifetime/model/borrow_sep.v

theories/lifetime/model/creation.v

theories/lifetime/model/definitions.v

theories/lifetime/model/faking.v

theories/lifetime/model/in_at_borrow.v