patch applied (ghc): initial, very incomplete tags generator

[Simon Marlow]

Fri Sep 15 16:50:33 PDT 2006  Norman Ramsey <nr at eecs.harvard.edu>
  * initial, very incomplete tags generator
  The ultimate goal is to replace hasktags with 
  a tags generator based on GHC-as-a-library.
  This file is a very incomplete first cut.

    A ./utils/ghctags/
    A ./utils/ghctags/GhcTags.hs
    A ./utils/ghctags/Makefile