added -a to trace show as tab complete and map

BauSystem_Main/src/de/steamwar/bausystem/Mapper.java

@@ -67,6 +67,7 @@ public class Mapper {
         showModeParameterTypesMap.put("-xz", ShowModeParameterType.INTERPOLATE_XZ);
 
         showModeParameterTypesMap.put("-advanced", ShowModeParameterType.ADVANCED);
+        showModeParameterTypesMap.put("-a", ShowModeParameterType.ADVANCED);
         showModeParameterTypesMap.put("advanced", ShowModeParameterType.ADVANCED);
         showModeParameterTypesMap.put("a", ShowModeParameterType.ADVANCED);