Commands

- Implemented the ability to iterate over installed Command objects,
  to augment the '_commands' command.
- Renamed verbosity tokens, to de-pluralize them.

src/text.cpp

@@ -402,7 +402,7 @@ std::string ucFirst (const std::string& input)
 ////////////////////////////////////////////////////////////////////////////////
 const char* optionalBlankLine ()
 {
-  return context.verbose ("blanklines") ? newline : noline;
+  return context.verbose ("blank") ? newline : noline;
 }
 
 ////////////////////////////////////////////////////////////////////////////////