patch applied (testsuite): Check float values are within a small tolerance inside barton-mangler

[Ian Lynagh]

Thu Apr  5 07:25:08 PDT 2007  Ian Lynagh <igloo at earth.li>
  * Check float values are within a small tolerance inside barton-mangler
  Saves the test from failing due to small FP differences.

    A ./tests/ghc-regress/programs/barton-mangler-bug/Expected.hs
    M ./tests/ghc-regress/programs/barton-mangler-bug/Main.hs -2 +3
    M ./tests/ghc-regress/programs/barton-mangler-bug/Plot.lhs -11 +31
    M ./tests/ghc-regress/programs/barton-mangler-bug/PlotExample.lhs -2 +2
    R ./tests/ghc-regress/programs/barton-mangler-bug/barton-mangler-bug.stdout-x86_64-unknown-linux