Enhancement - _config

- Merged Fredde's _config command with prior bug fix.

src/main.h

@@ -66,6 +66,7 @@ std::string handleTags ();
 std::string handleCompletionTags ();
 std::string handleCompletionCommands ();
 std::string handleCompletionIDs ();
+std::string handleCompletionConfig ();
 std::string handleVersion ();
 std::string handleDelete ();
 std::string handleStart ();