making docs for ghc6.6

[Michael Shulman]

When I do `make html' in ghc6.6, haddock complains about an
unrecognized option `source-modules'.  It appears this option was
added in the most recent haddock 0.8; perhaps ghc6.6 should check the
version of haddock installed?

I went ahead and installed haddock 0.8, and now the documentation gets
made, but `make install-docs' only installs the library documentation,
not the users guide.  Am I doing something wrong?

Mike