Radeon GLAMOR vs. Radeon EXA vs. Catalyst On X.Org Server 1.17

With Ubuntu 15.04 now shipping X.Org Server 1.17, I've run some 2D performance tests comparing the performance of this newest Ubuntu version when using the open-source Radeon graphics driver -- both with the EXA and GLAMOR acceleration methods -- compared to the new Catalyst Linux driver beta.