INT 21 - DOS 1+ - RENAME FILE USING FCBsee File Control Block
	AH = 17h
	DS:DX -> modified FCBsee File Control Block (see also #01345)
		the old filename ('?' wildcards OK) is in the standard location
		while the new filename ('?' wildcards OK, no drive) is stored
		in the 11 bytes beginning at offset 11h
Return: AL = status
	    00h successfully renamed
	    FFh no matching files,file is read-only, or new name already exists
Notes:	subdirectories may be renamed using an extended FCBsee File Control Block with the
	  appropriate attribute, as may volume labels
	DR DOS checks password attached with AX=4303h before permitting rename
SeeAlso: AH=0Fh,AH=13h,AX=4303h,AH=56h,INT 2F/AX=1111h