Minor tweaks to eliminate compiler warnings.

git-svn-id: https://svn.microneil.com/svn/CodeDweller/trunk@6 d34b734f-a00e-4b39-a726-e4eeb87269ab

configuration.hpp

@@ -706,7 +706,8 @@ class ConfigurationMnemonic {
 
 class Configurator {                                                            // Configurators exist
   public:
-    virtual void operator()(ConfigurationElement& E, ConfigurationData& D) = 0; // Pure virtual configurator.
+    virtual void operator()(ConfigurationElement& E, ConfigurationData& D) = 0; // Pure virtual configurator.
+    virtual ~Configurator() {}                                                  // Virtual dtor keeps warnings away.
 };
 
 //// Include our inline methods ////////////////////////////////////////////////