Even more cool README for the test branch

Thanks to Mike Taht - the Asterisk Rock Band Leader - we now have a README with hyperlinks to the bug reports in Mantis.

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A good way to discover the test branch before you help me test it.

Today, I've updated the func_realtime so it loads properly (thanks bweschke) and added an update to the cdr_radius driver. The radius CDR driver is now a mix of two drivers - the best of two tested drivers where the developers decided to combine their work. Good work in a community fashion!

Thanks for all the help and all the contributions. Keep testing!

/Olle