Re-worked the system pathnames (pc.c), renamed cfg_path to usr_path.
Other small things here and there.
Logitech bus mouse re-worked, should be OK now.
Bugfixes in config.c regarding CD-ROM defaults and IDE channel reading;
Applied all the PCem Voodoo commits;
The Sound Blaster cards' OPL can now be disabled for slight performance gain.
IBM.H is gone, video stuff re-organized. Keyboard stuff reorganized.
Machines that have their own video, mouse and/or keyboard now have all this in their machine file.
Fixed and other cleanups here and there.