Experimental support for a comment in the files' preamble in extraction.

Scheme comments are output on a single line because Ocaml's Format
module which serves as a backend to Pp has an integer, rather than a string
as identation value, so we cannot make it so that each new line in the
comment starts with ";; ".

I've tried something with Pp.ifb but it was hackish at best and had somewhat
strange results.

Known bug: as Pp.std_ppcmds is non-persistent, the comment is actually printed
only once per Extraction command, even if it outputs several files.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@15763 85f007b7-540e-0410-9357-904b9bb8a0f7

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