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.postscript/src/org/eclipse/birt/report/engine/emitter/postscript/device/PostscriptPage.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.emitter.postscript.page.IPageDevice#drawText(java.lang.String,
	 *      float, float,
	 *      org.eclipse.birt.report.engine.layout.pdf.font.FontInfo, float,
	 *      float, java.awt.Color, boolean, boolean, boolean)
	 */
	public void drawText( String text, int textX, int textY, int width,
			int height, TextStyle fontStyle )
	{
		writer.drawString( text, convertToPoint( textX ),
				convertToPoint( textY ), fontStyle.getFontInfo( ),
				convertToPoint( fontStyle.getLetterSpacing( ) ),
				convertToPoint( fontStyle.getWordSpacing( ) ), fontStyle
						.getColor( ), fontStyle.isLinethrough( ), fontStyle
						.isOverline( ), fontStyle.isUnderline( ), fontStyle
						.getAlign( ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.emitter.postscript.page.IPageDevice#drawImage(java.io.InputStream,
	 *      float, float, float, float)
	 */
	public void drawImage( InputStream input, int imageX, int imageY,
			int height, int width, String helpText ) throws Exception
	{
		writer.drawImage( input, convertToPoint( imageX ),
				convertToPoint( imageY ), convertToPoint( width ),
				convertToPoint( height ) );