Applied the mainline PCem slight CPU emulation speedup commit;
Added emulation of removable SCSI hard disks;
CD-ROM image handler now uses C FILE's (with the 64-bit size calls) instead of C++ iostreams, ISO images bigger than 2 GB should work properly again;
Split RLL/ESDI and XT IDE disks to their own bus types;
Turned status bar pane meaning and hard disks and CD-ROM BUS numbers to #define's;
Other miscellaneous cleanups.
Generated MAC addresses are back, with 0xDE as first byte rather than 0x00, SLiRP DHCP still works (seems it did not like the first byte being 0x00);
The FDC Read and Write commands now return the correct sector ID in the result phase when the last transferred sector equals EOT and DMA is over, fixes floppies on Windows 2000;
Fixed floppy FIFO threshold handling.
Overhauled the configuration files so that the global variables are now subdivided into sections;
Fixed CD-ROM MODE SENSE page 0x2A which was being incorrectly reported as not implemented, fixes among other things Rayman 1 and Spellcross: The Last Battle (both now see the CD-ROM and play CD Audio fine).
