You can read about the previous bugfixes and changes made for the beta version here:
Bugfix
- Bug [3293679] - getTurnRateRadians incorrect for negative velocity.
- Fixed issues with unit-testing and building Robocode on Linux.
Download Robocode 1.7.3.0 (final) from here
Download Robocode .NET plug-in 1.7.3.0 from here
Download Robot testing plug-in 1.7.3.0 from here