Fix missing lift in VM and native compiler (second part of rocq-prove…

…r#2729).

Correct pl version number

Update CHANGES.

Side effect free implementation of admit (Isabelle's oracle)

new Axiom in Logic.v,  proof_admitted : False.

admit now simply cases proof_admitted and does
not create a new Axiom in the environment.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16673 85f007b7-540e-0410-9357-904b9bb8a0f7