darcs: disable test suite to avoid 127 exit code
haskell-statistics: disable 'doCheck' to avoid test suite failures

Running 1 test suites...
Test suite tests: RUNNING...
Tests for all distributions:
  Tests for: BetaDistribution:
    C.D.F. sanity: [OK, passed 100 tests]
    CDF limit at +tests: <stdout>: commitBuffer: invalid argument (invalid character)
Test suite tests: FAIL
Test suite logged to: dist/test/statistics-0.10.2.0-tests.log