haddock docs are not relocatable in Windows

[eivuokko]

Haddock docs are not installed sensibly in Windows. They go under Common Files, which is silly; Their path doesn't contain compiler version, which makes it hard to install docs for same package version installed for different compilers/versions and they are not relocatable because

• default uses absolute paths for references
• with a lot of work they can refer to each other via relative paths, but ghc installation isn't installed in similar fashion. And then all packages must also be installed into same prefix. (ie user-only vs admin installs)

[duncan]

Changing the default location is easy see Distribution.Simple.InstallDirs?.

Making the docs relocatable is hard.

Fixing the default location should be done for cabal 1.2, the other will have to be deferred.

[duncan]

The default location has been improved. It doesn't contain the compiler however. But you can override that with --docdir=...

Changing summary, priority & difficulty to reflect the remaining part of the problem.

[elga]

*  simyo