patch applied (cabal): Rewrite the Program abstraction and the ProgramConfiguration database

[Duncan Coutts]

Thu Aug 16 20:38:41 PDT 2007  Duncan Coutts <duncan at haskell.org>
  * Rewrite the Program abstraction and the ProgramConfiguration database
  Also make the follow on changes to everything that uses Program.
  The notion of a program is now split into the abstract notion of a program
  that we know about and might be able to configure, and a configured program
  that we can actually run. The ProgramConfiguration database is similarly
  split. We still keep user-supplied loation and arguments and use them when
  we configure programs. The abstract Program now has functions to search for
  the program on the system and for finding the version number. This allows
  for more generic configuration of programs.

    M ./Distribution/Compiler.hs -2 +2
    M ./Distribution/PreProcess.hs -13 +16
    M ./Distribution/Program.hs -282 +461
    M ./Distribution/Setup.hs -15 +19
    M ./Distribution/Simple.hs -7 +4
    M ./Distribution/Simple/Configure.hs -66 +30
    M ./Distribution/Simple/GHC.hs -70 +52
    M ./Distribution/Simple/Haddock.hs -18 +8
    M ./Distribution/Simple/Hugs.hs -11 +13
    M ./Distribution/Simple/JHC.hs -11 +12
    M ./Distribution/Simple/NHC.hs -11 +12
    M ./Distribution/Simple/Register.hs -1 +1
    M ./Distribution/Simple/SetupWrapper.hs -3 +4
    M ./Distribution/Simple/SrcDist.hs -13 +9