Fixed (and changed) infoH.
Fixed (and changed) infoH.

The detection of new hypothesis was bugged.

Now infoH behaves like "Show Intros": it performs tac, grab
information on hypothesis names but let the state unchanged.

FTR: infoH is fundamentally unable to be correct in presence of
tactics that delete hypothesis and reuse there names. Like destruct or
induction. Fortunately destruct and induction now come with a variant
asking that the hypothesis is not deleted. To guess for the right
as-close for [induction H], do [infoH induction !H]. This will not
create the same names as induction would have by itself but at least
there will be the right number of hypothesis.

herbelin/github-coq,herbelin/github-coq,SkySkimmer/coq,william-lawvere/coq,Zimmi48/coq,ppedrot/coq,william-lawvere/coq,ppedrot/coq,Ptival/coq,ejgallego/coq,mattam82/coq,Zimmi48/coq,Ptival/coq,letouzey/coq-wip,letouzey/coq-wip,Matafou/coq,ejgallego/coq,maximedenes/coq,ejgallego/coq,coq/coq,jpdeplaix/coq,amintimany/coq,ejgallego/coq,coq/coq,Lionel-Rieg/coq,SkySkimmer/coq,gares/coq,jpdeplaix/coq,gares/coq,JasonGross/coq,gares/coq,silene/coq,SkySkimmer/coq,maximedenes/coq,amintimany/coq,letouzey/coq-wip,gares/coq,Ptival/coq,gares/coq,silene/coq,william-lawvere/coq,amintimany/coq,Zimmi48/coq,maximedenes/coq,coq/coq,herbelin/github-coq,ppedrot/coq,coq/coq,Lionel-Rieg/coq,ppedrot/coq,mattam82/coq,SkySkimmer/coq,JasonGross/coq,maximedenes/coq,ppedrot/coq,mattam82/coq,JasonGross/coq,silene/coq,maximedenes/coq,Lionel-Rieg/coq,letouzey/coq-wip,letouzey/coq-wip,Zimmi48/coq,Matafou/coq,jpdeplaix/coq,JasonGross/coq,Matafou/coq