move Display in gui package

- and some code indentation

build.xml

@@ -34,7 +34,7 @@
     <!-- Put everything in ${build} into the artloglaby-${distversion}.jar file  ( ${DSTAMP} not used yet )-->
     <jar jarfile="${dist}/lib/artloglaby-${distversion}.jar" basedir="${build}">
             <manifest>
-              <attribute name="Main-Class" value="org.artisanlogiciel.games.Display"/>
+              <attribute name="Main-Class" value="org.artisanlogiciel.games.maze.gui.Display"/>
 	      <attribute name="Class-Path" value="libs/${artgraphicslib}.jar"/>
             </manifest>
 	    <fileset dir="lang" includes="**" />