2002-08-25 nalin
	* src/vte.c:  Make nd() move right but not wrap -- according to Strang
	it's undefined, but xterm doesn't wrap it.  Separate do/DO from sf/SF
	and up/UP from sr/SR, because the scrolling behavior is supposed to be
	different.  Add support for decset/decreset 7 (wraparound mode) and
	1051 (Sun keyboard).  Add support for DECALN.  Remove some type checks
	from run-time which the compiler can catch with certainty.