Optimize imports in all files, remove useless whitespace in some and fix indentation

tools/checkstyle.xml

@@ -9,9 +9,9 @@ page at http://checkstyle.sourceforge.net/config.html -->
 
 <module name="OpenPgpChecker">
 
-  <module name="SuppressionFilter">
+  <!--<module name="SuppressionFilter">
    <property name="file" value="tools/suppressions.xml"/>
-  </module>
+  </module>-->
 
   <module name="RegexpSingleline">
     <!-- Requires a copyright notice in each file.