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/PostscriptWriter.java
out.println( "% build a temporary dictionary" );
		out.println( "20 dict begin" );
		out.print( "/pix " );
		out.print( originalWidth * 3 );
		out.println( " string def" );
		out.println( "% define space for color conversions" );
		out.print( "/grays " );
		out.print( originalWidth );
		out.println( " string def  % space for gray scale line" );
		out.println( "% lower left corner" );
		out.print( x );
		out.print( " " );
		out.print( y );
		out.println( " translate" );
		if ( height == 0 || width == 0 )
		{
			height = originalHeight;
			width = originalWidth;
		}
		out.println( "% size of image" );
		out.print( width );
		out.print( " " );
		out.print( height );
		out.println( " scale" );
		out.print( originalWidth );
		out.print( " " );
		out.print( originalHeight );
		out.println( " 8" );
		out.print( "[" );
		out.print( originalWidth );