Enable several more code checkstyles

checkstyle.xml

@@ -32,15 +32,20 @@
         <module name="Indentation"/>
         <module name="InnerAssignment"/>
         <module name="MethodParamPad"/>
+        <module name="MultipleVariableDeclarations"/>
         <module name="NoWhitespaceBefore">
             <property name="allowLineBreaks" value="true"/>
         </module>
         <module name="OneStatementPerLine"/>
+        <module name="PackageDeclaration"/>
         <module name="ParenPadCheck"/>
         <module name="RedundantImport"/>
+        <module name="RequireThis"/>
         <module name="SimplifyBooleanExpression"/>
         <module name="SimplifyBooleanReturn"/>
         <module name="StringLiteralEquality"/>
+        <module name="SuperClone"/>
+        <module name="SuperFinalize"/>
         <module name="TypecastParenPad"/>
         <module name="UnusedImports"/>
         <module name="WhitespaceAround">