patch applied (cabal): Merge InstallDirTemplates into InstallDirs

[Duncan Coutts]

Sat Dec  8 10:23:34 PST 2007  Duncan Coutts <duncan at haskell.org>
  * Merge InstallDirTemplates into InstallDirs
  This simplifies things and makes it a bit more versatile since
  we can use things like InstallDirs (Maybe PathTemplate).

    M ./Distribution/Simple/Configure.hs -12 +11
    M ./Distribution/Simple/Haddock.hs -2 +2
    M ./Distribution/Simple/InstallDirs.hs -148 +166
    M ./Distribution/Simple/Register.hs -11 +11