Command
QisLib_SetZoomIn

Purpose

Function:
	int QisLib_SetZoomIn();

Inputs: -

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

Errors:
	-1: File open in progress, operation not permitted.

Description:
	- Sets the window such that it appears like a zoom in by a factor of 2.
	- The effect of this operation can be seen when QisLib_Redraw, QisLib_GetDataVector
	etc. are called.
	- Equivalent to QisLib_SetWindow except that window extents to be set are calculated
	from current window.
	- QisLib_SetZoomIn maintains the aspect ratio that was set by the last set window
	function call (QisLib_SetWindow or QisLib_SetExactWindow).

References:
	QisLib_SetWindow
	QisLib_SetExactWindow