RowCol

History
2.1	(28 Jun '93) Added resource ShrinkToFit
2.2	(5 Jul '93) Removed spacing resource (children of rel_width =
	1.0 didn't fit because of it; besides, the same effect can be
	achieved by setting frameOffset on the children)
2.3	(3 Nov '93) Bug fix in layout: division by 0 if 0 children
