Bug 194371 Use page emitter framework to implement ppt emitter.
In order to keep consistent with pdf and postscript, ppt need to use page emitter framework.
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTRender.java
* coordinate in PPT.
	 * 
	 * @param layoutX
	 *            the X coordinate specified from layout
	 * @return the PPT X coordinate
	 */
	private double layoutAreaX2PPT( int layoutX )
	{
		return pptMeasure( layoutX );
	}
	/**
	 * Converts the top Y coordinate of an Area from layout to the start Y
	 * coordinate in PPT, to the bottom Y coordinate in PPT.
	 * 
	 * @param layoutY
	 *            the Y coordinate specified from layout
	 * @param areaHeight
	 *            the height of the area whose coordinate need to be converted.
	 *            To text area, the height is from the top of the text to the
	 *            text's baseline.
	 * @return the PPT Y coordinate
	 */
	private double layoutAreaY2PPT( int layoutY )
	{
		return pptMeasure( layoutY );
	}
	/**
	 * The class defines container position of report.
	 */
	private class ContainerPosition