INT 2F - NETWORK REDIRECTOR - RENAME REMOTE FILE

	AX = 1111h
	SS = DS = DOS DS
	SDA first filename pointer = offset of fully-qualified old name
	SDA second filename pointer = offset of fully-qualified new name
	SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1112h,INT 21/AH=56h,INT 21/AH=60h