Bug 196272 Text position is incorrect in postscript and ppt.
Text position need to be ajusted according to baseline position.
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/device/PPTPage.java
{
		writer.drawImage( imageData,
				extension,
				convertToPoint( imageX ),
				convertToPoint( imageY ),
				convertToPoint( height ),
				convertToPoint( width ),
				helpText );
	}
	public void drawImage( String uri, String extension, int imageX,
			int imageY, int height, int width, String helpText )
			throws Exception
	{
		if ( uri == null )
		{
			return;
		}
		byte[] imageData = null;
		InputStream imageStream = new URL( uri ).openStream( );
		imageData = new byte[imageStream.available( )];
		imageStream.read( imageData );
		drawImage( imageData,
				extension,
				imageX,
				imageY,
				height,
				width,
				helpText );
	}
	public void drawLine( int startX, int startY, int endX, int endY,