All changes in this commit are standalone changes only but could usefully be used inplace as well: Don't store package.conf.installed; use a pipe to avoid problems from using stale package.confs.  Also, use PACKAGE, PACKAGE_DEPS, LIBRARY and LIBDIR settings from Makefile when installing pkg.  This requires some ugly sed hackery to overcome ghc-pkg not allowing trailing commas in a list: [a,b,c,]