Moved some old documents out of the top-level directory and into a folder olddocs/ to make things neater.

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+A Stack is a stack of controls arranged horizontally or vertically.
+	If horizontal, all controls take the same heights, and use their preferred widths.
+	If vertical, all controls take the same widths, and use their preferred heights.
+
+PROBLEM
+	We want to have controls that stretch with the window
+SOLUTION
+	Delegate one control as the "stretchy" control.
+		s := NewVerticalStack(c1, c2, c3)
+		s.SetStretchy(1)	// c2
+	When drawing, all other controls have their positions and sizes determiend, then the stretchy one's is.
+
+PROBLEM
+	We want to have a control that's anchored (resizes with) the top left and one that's anchored with the top right.
+SOLUTION
+	Allow stretchiness for arbitrary controls
+		s.SetStretchy(1)
+		s.SetStretchy(2)
+	When drawing, the sizes of non-stretchy controls are determined first, then all stretchy controls are given equal amounts of the rest.
+	The preferred size of the stack is the preferred size of non-stretchy controls + (the number of stretchy controls * the largest preferred size of the stretchy controls).
+
+PROBLEM
+	Non-equal size distribution of stretchy controls: for instance, in a horizontal stack, a navigation bar is usually a fixed size and the content area fills the rest.
+SOLUTION
+	I'm not entirely sure how to fix this one yet; I do know for a navigation pane the user is usually in control of the size, so... will figure out later.