Add source code links to Haddock docs
Right now we can only manage to add a source code link for the module, but that's better than nothing. I had to put the list of core packages in a Makefile variable, $(CorePackages), so we'll have to be careful to keep this up to date. (I could have slurped it out of libraries/core-packages with $(shell), but that's ugly and really slow on Windows). There are a couple of new tweakables: CorePackageSourceURL and ExtraPackageSourceURL in config.mk.in, set these to the appropriate patterns for generating source links. (when we merge this patch onto the HEAD we'll have to tweak these settings). Unfortunately it still doesn't work for all the modules, because modules compiled without -cpp don't get any #line directives. More hackery required...
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