scan-api now in guile-core/scripts

[Thien-Thi Nguyen]

and hack/scripts/scan-api is now gone.  here are commands to make the
transition (new scan-api has same interface as old).

  cd hack
  ( cd core/scripts ; cvs update )
  ( cd scripts ; cvs update ; make gscripts-symlinks )

also, annotate-api-groupings is now folded into scan-api, and so the
standalone script has been removed.  in the end, the flow is basically:

  [build]
  [edit $top_srcdir/doc/groupings.alist]
  cd $top_builddir
  $mscripts/update-guile-api.alist

this runs scan-api, and processes the groupings, the end result being
new doc/guile-api.alist checked in w/ "((meta ...) (interface ...))".

there is a provisional groupings.alist for HEAD at this time.

thi