Relaxing the constraint on eta-expanding on the fly while looking for

notation to use at printing time. We now allow to print "sigT P" as
"{x:_ & P x}", generating a "_" for the missing type, when the notation
is defined by 'Notation "{ x : A  & P }" := (sigT (fun x:A => P))'.

Do better, and change the notation to "(sigT (A:=A) (fun x => P))" so
that the type is known even when eta-expansion is needed.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16467 85f007b7-540e-0410-9357-904b9bb8a0f7

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