970825: plformat / P_p
	plotup moves are also updated by P_p but should not. But currently
	plformat uses penup moves to update for its bounding box. Probably
	plformat should use P_winupdate directly.

990101:	msdos-version currently out of order. Needs conversion to C++
	use version 1.02
990502: plframe in plpolv.cc (doc) doesn't work at the end (after clip/unclip)
	needed to put it right after plaxes. 
	see also plfunc.cc in doc: plframe doesn't show up here either
	same in plloop.cc
000211: something wrong with clipping in landscape mode. try:
	plinit PSL t 100 50 15 15 "" "" plaxes 0 0 100 100 50 30 "" "" "" 
	I therefore had to remove using PSL instead of PS when xl>yl in xyplot
010108: The problem is: plinit is programmed such that you can change PS into PSL
	and leave A4 there. But if you replace A4 with 210,297 you need to swap
	the two numbers after changging from PS to PSL. This is counterintuitive.
030408:	doc/{plfill,plfunc,plhiss}.c generate wrong eps bounding boxes

