displayLayerManager

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 The display layer manager node manages the list of display layers currently
 available, including keeping track which one is the current one, and
 enforcing a unique number per display layer.

 The current display layer is the one whos number matches the "current"
 input attribute's value.  It is an error to have no match, although this
 condition will default the current display layer to the default layer.

 The default layer is always number 0, and is always connected at
 multi-index 0 of the 'displayLayers' multi-attribute.  Other display layers
 are connected in order of their priority (which is currently only used for
 the layerbar display ordering).

displayLayer, renderLayerManager, renderLayer

currentDisplayLayer, displayLayerId

Long name (short name)	Type	Default	Flags
currentDisplayLayer (cdl)	short	0
Number of the display layer that is the "current" one
displayLayerId (dli)	short	0
Display layer id. Connections here indicate display layer existence.