Dividers

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`Dividers`

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is an option for Grid and related constructs that specifies where and how to draw divider lines.

Details

	All	draw all dividers
	None or False	draw no dividers
	{}	draw dividers specified by the Frame option
	True	draw dividers around the exterior only
	Center	draw dividers between interior items only
	g	draw all dividers using graphics directive g

For Grid and related constructs, lists of settings can be given. Common cases include:

	{All, False}	put dividers at every horizontal position (column lines)
	{False, All}	put dividers at every vertical position (row lines)
	{{False, True}, False}	put a divider before the second column
	{False, {False, True}}	put a divider before the second row

	{s₁,s₂,…,s_n}	use s₁ through s_n; then use defaults
	{{c}}	use c in all cases
	{{c₁,c₂}}	alternate between c₁ and c₂
	{{c₁,c₂,…}}	cycle through all c_i
	{s,{c}}	use s, then repeatedly use c
	{s₁,{c},s_n}	use s₁, then repeatedly use c, but use s_n at the end
	{s₁,s₂,…,{c₁,c₂,…},s_m,…,s_n}	use the first sequence of s_i at the beginning, then cyclically use the c_i, then use the last sequence of s_i at the end
	{s₁,s₂,…,{},s_m,…,s_n}	use the first sequence of s_i at the beginning and the last sequence at the end
	{i₁->v₁,i₂->v₂,…}	specify what to use at positions i_k
	{spec,rules}	use rules to override specifications in spec

The s_i and c_i can be True, False, or an explicit graphics directive.
Possible graphics directives include Thick, Thin, Dashed, Dotted, as well as color, thickness and dashing directives, and composite directives specified by Directive.
For a grid with n items in a particular direction, Dividers can specify settings for dividers in the gaps between items, starting before the first element, and ending after the last element.
Dividers are always placed at the center of the gaps between items.
Dividers never extend into items that span rows or columns.