help config: explain that config files do not exist by default Inspired by critique given on StackOverflow where a user writes: I can have a good guess at what "%USERPROFILE%" might signify but none of the files listed in the "hg help config" output exist after running the installer. Previous experience would suggest that missing files mean something somewhere has gone seriously wrong. http://stackoverflow.com/questions/2329023/2351139#2351139