We are now more lenient in parsing the packages file, and
we don't use any GNUisms. Based on a patch from Matthias Kilian.

We don't install dph etc, so don't put them in the doc index.

Silences a (harmless) error from tar when making bindists

It was making incorrect URLs due to a shell script error.

We used to just get
    ghc: panic! (the 'impossible' happened)
      (GHC version 6.13.20091128 for x86_64-unknown-linux):
        too few bytes. Failed reading at byte position 32753
with no indication of what was being parsed.

On MSYS
    sed 's/.*[ \t]//'
wasn't matching
    version:<tab>1.0
so I've switched to
    's/.*[[:space:]]//'
which works on Linux, cygwin and MSYS.

You can now have multiple versions of a package installed, and
gen_contents_index will do the right thing.

 - the package DB is a directory containing one file per package
   instance (#723)

 - there is a binary cache of the database (#593, #2089)

 - the binary package is now a boot package

 - there is a new package, bin-package-db, containing the Binary
   instance of InstalledPackageInfo for the binary cache.

Also included in this patch

 - Use colour in 'ghc-pkg list' to indicate broken or hidden packages
  
   Broken packages are red, hidden packages are 
  
   Colour support comes from the terminfo package, and is only used when
    - not --simple-output
    - stdout is a TTY
    - the terminal type has colour capability

 - Fix the bug that 'ghc-pkg list --user' shows everything as broken

Including help for directory-specific targets, such as 'make 1' in ghc

i.e. not dph, and hence not stage2