Attempt to fix sound fluttering in waiting for a better fix from mainline PCem;
Attempt to make the Sound Blaster louder;
Removed excess logging from cdrom_ioctl.c.
Applied all mainline PCem commits;
CD-ROM sound thread is now disabled if all CD-ROM drives are either disabled or have audio disabled;
Fixed the displayed incorrect zero cylinders, head, and sectors per cylinder when loading an already existing HDI image;
Fixed the CD-ROM audio menu item not checking/unchecking correctly.
Four CD-ROM drives are now emulated;
ATAPI DMA is now emulated;
Unified CD-ROM pass through to host drive handling;
Applied all (applicable) mainline PCem commits.
Fixed FDI stream parameters passed to the 86F handler, FDI stream images now read correctly again;
The National Semiconductors PC87306 SuperI/O chip now supports enhanced FDC mode.
