Changes

==== arnoldemu's testbench results ====

* 27FAIL01/29FAIL01 : read_track6/read_track10 - very big sector size counter not implemented (more than 512B)

* 3DFAIL/45FREEZE : read_data_ov/test_write_ov - using flag simpleDSK.IS_ARNOLDEMU_TESTBENCH=false this test will fail/freeze in final version. It will not be implemented (does slow down some demos : 30YMD/Batman)