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Mouse: - Remove now useless code in mouse support in BIOS. - Implement INT 33h, AH=1Bh "Return mouse sensitivity" (returning hardcoded standard values since we don't support custom sensitivities) (AH=13h and 1Ah are marked as UNSUPPORTED). - INT 33h, AH=1Fh "Disable mouse driver" returns in ES:BX the old INT 33h vector value: implement that. - Implement INT 33h, AH=21h "Software reset", AH=24h and 4Dh and 6Dh "Software version and mouse info", "pointer to copyright string" and "version 'string'" functionalities. DOS: - Initialize in Win2k3-ntvdm-compatible order the DOS drivers: NUL, then CON, then XMS, and then EMS. - Fix segment/offset inversion usage in INT 21h, AH=5Ch "Lock/Unlock region of file": when using MAKELONG macro to build a far pointer, the first parameter (loword) is the offset, and the second parameter (hiword) is the segment. svn path=/trunk/; revision=67518