patch applied (ghc): Improve hierarchical module name handling in MkExternalCore

[Tim Chevalier]

Wed Mar 19 12:04:29 PDT 2008  Tim Chevalier <chevalier at alum.wellesley.edu>
  * Improve hierarchical module name handling in MkExternalCore
  
  It's easier for the External Core parser if MkExternalCore prints
  module names like:
     base:GHCziBase
  rather than like:
     base:GHC.Base
  (which it was doing before.)
  
  So now we z-encode the hierarchical module-name part of a module
  name, but don't z-encode the ':'.
  
  I also removed some old comments that don't seem relevant anymore.

    M ./compiler/coreSyn/MkExternalCore.lhs -15 +13