J2DBench can be improved

-Warnings about incorrect test name should be removed.(2 tests affected after enums removing in 8042199, because default toString now used)
-Translucent Volatile images should be supported as source and destination.
-Interpolation hint should be supported
-drawImage + scale 0.5 should be supported to test non-retina blits on the retina display.
-VolatileI.getSnapshot can be used as a separate test also.
-All panels should use JScrollPane, otherwise it is impossible to use it on small screens
-Images 4000x4000 should be supported