Log Message:
Update dvipsk to 5.991.

Changes:
	* output.c (hvpos): recover the old code in hvpos() for japanese
	because the changed code leads to incorrect result in some cases.
	other cases than japanese are not affected.
	* writet1.c (t1_check_unusual_charstring): new fn.
	(t1_subset_charstrings): call it.  This resolves a bug reported by
	Knuth when there is a newline between the /CharStrings and the
	following number (dict size).