Update the "config get <section> <key>" command to "config get [<section>] [<key>]"

The config get command shows a current config value on the console.
Now, if <key> is omitted then all the values for the given section are printed.
If <section> is ommitted then all sections and all keys are printed.
Current config can also be dumped to a file using "config save <path>".  This can be handy for resolving or eliminating config issues

OpenSim/Framework/Console/ConsoleBase.cs

@@ -75,6 +75,11 @@ namespace OpenSim.Framework.Console
         {
             System.Console.WriteLine(text);
         }
+        
+        public virtual void OutputFormat(string format, params string[] components)
+        {
+            Output(string.Format(format, components));
+        }
 
         public string CmdPrompt(string p)
         {