added a safeguard FORCE_ZONE to integer edits
	so that numerals which have zero-zones in the shift register
	are not mistaken for an empty shift register

	this concerns wrapper assemblies which can have any data code
	as well as any byte size up to 24 bits

	FORCE_ZONE switches on if '0' AND 0000F0 = 0
	and vacated columns in the shift register are zoned 128
	then the empty test is polarity instead of default test zero
	integer edits with zero zones data code numeral bits 7..4

        this concerns wrapper assemblies which can have any data code
        as well as any byte size up to 24 bits

        FORCE_ZONE switches on if '0' AND 0000F0 = 0
        and vacated columns in the shift register are zoned 128
        then the empty test is polarity instead of default test zero