Update Readme and development wrt. technical appendix.

README.md

theories/lifetime/frac_borrow.v

theories/lifetime/lifetime.v

theories/lifetime/lifetime_sig.v

theories/lifetime/model/accessors.v

theories/lifetime/model/creation.v

theories/lifetime/model/primitive.v

theories/lifetime/model/reborrow.v

theories/lifetime/na_borrow.v

theories/typing/lib/arc.v

theories/typing/lib/rc/rc.v

theories/typing/lib/rc/weak.v

theories/typing/lib/rwlock/rwlock_code.v

theories/typing/util.v