Command
QisLib_SetLayersOn

Purpose

Function:
	int QisLib_SetLayersOn(const char* LayerString);

Inputs:
	LayerString: A string with the following format [Backus-Naur form]
	< LayerString >: "All" | < LayerEntry > { "," < LayerEntry > }
	< LayerEntry > : < Layer > { ":" < DataType > }
	< Layer > : A valid layer number. (Refer to Support & Compliance section)
	< DataType > : A valid datatype number. (Refer to Support & Compliance section)

Return:
	success: 0
	failure: one of the following values :

Errors:
	-1: QisLib has not been initialized.
	-2: The specified input is invalid (possibly null).
	-3: The format of the input arguments is invalid.
	-4: File open in progress, operation not permitted.

Description:
	- Instructs the QisLib to turn on the specified layer:datatypes.
	- If only the layer number is specified, all datatypes for that layer are turned on.
	- All other layer:datatype combinations will be turned off. Hence, multiple calls to
	this function is not cumulative.
	- Invalid layer or datatypes numbers will be ignored.

Example:
	QisLib_SetLayersOn("1,2:3");
	// Turn on layer 1 and all datatypes
	// for layer 1
	// Turn on layer 2 datatype 3 only
	// All other layer:datatype
	// combinations are turned off
	QisLib_SetLayersOn("All");
	// Sets all layer:datatype
	// combinations on.