[GHC] #9508: Rename package key

[GHC]

#9508: Rename package key
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       Reporter:  ezyang             |                   Owner:  ezyang
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.9
       Keywords:  backpack           |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 We were planning on renaming package key to something different.  The two
 proposals on the table are "package instance" (which I don't like) and
 "library ID".

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9508>
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