Max Horn 00cd966f3d Some tweaks and fixes for Common::Rational
* Fix Common::gcd to work with negative input
* This fixes a bug in Common::Rational's multiplication code
* Add some more basic unit tests (including one which checks for
  the now fixed multiplication bug)
* cleanup

svn-id: r49064
2010-05-17 22:07:58 +00:00
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