QTest results more visible - add color

[T4ng10r]

Hi,
In earlier releases of Qt I found that QTEST_COLORED environment variable generated colored test result. Like green for PASS and red for FAIL.
I tried this lately and it's not working anymore. I've read QTestLib source code for any color related entries and I've found only comment in qplaintestlogger.cpp

// In colored mode, printf above stripped our nonprintable control characters.

// In colored mode, printf above stripped our nonprintable control characters.

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Or maybe there are other options to make test results more human readable.