For easier comparison, list packages in same order as ghc-pkg

./ghc-7.8.3/inplace/bin/ghc-pkg --no-user-package-db list

It initially thought some packages were missing from the list. It turns out
they are not actually core packages, but specific to GHC only. Maybe they
could be listed under a different section in the changelog on the platform
homepage. See this thread:
http://www.haskell.org/pipermail/libraries/2014-September/023802.html