patch applied (testsuite): Calibrate the testsuite timeout if a value of -1 is given

[Ian Lynagh]

Thu Apr  5 06:33:31 PDT 2007  Ian Lynagh <igloo at earth.li>
  * Calibrate the testsuite timeout if a value of -1 is given

    M ./driver/runtests.py +6
    M ./driver/testglobals.py +3
    M ./mk/test.mk +1
    A ./timeout/Calibrate.hs
    M ./timeout/Makefile +8
    A ./timeout/calibrate