Combine post install commands in 'postInst' and add 'postCopy' hook.

The creation of the 'git-annex-shell' symlink was in 'postInst' hook.
I combined it with the man-page installation in a 'postInst' hook and
a 'postCopy' hook.  I don't understand how to use the `cabal copy`
command, but the examples I looked at defined both hooks.

Relevant comments from the source:

* man-page installation:

  See http://www.haskell.org/haskellwiki/Cabal/Developer-FAQ#Installing_manpages.

  Based on pandoc's and lhs2tex's 'Setup.installManpages' and
  'postInst' hooks.

  My understanding: 'postCopy' is run for `cabal copy`, 'postInst' is
  run for `cabal inst`, and copy is not a generalized install, so you
  have to write two nearly identical hooks.

  Summary of hooks:
  http://www.haskell.org/cabal/release/cabal-latest/doc/API/Cabal/Distribution-Simple-UserHooks.htm--
  Other people are also confused:

  * Bug: 'postCopy' and 'postInst' are confusing:
  http://hackage.haskell.org/trac/hackage/ticket/718

  * A cabal maintainer suggests using 'postCopy' instead of
  'postInst', because `cabal install` is `cabal copy` followed by
  `cabal register`:
  http://www.haskell.org/pipermail/libraries/2008-March/009416.html
  Although that sounds desirable, it's not true, as the reply and
  experiments indicate.

* the `cabal copy` command:

  ???: Not sure how you're supposed to use this.  E.g., when I do

     cabal install --prefix=/tmp/git-annex-install
     cabal copy --deistdir=/tmp/git-annex-copy

  I get the copy under

    /tmp/git-annex-copy/tmp/git-annex-install

  Also, `cabal install` fails when given a relative --prefix.

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