Argument Parsing

- Obsoleted Command::exectute  'commandLine' argument.  It is worse
  than unnecessary, it is an uncategorized raw argument string, which
  is only really useful for the 'execute' command, which itself now
  calls Arguments::combine to reconstruct the command line string.

src/commands/CmdHelp.cpp

@@ -44,7 +44,7 @@ CmdHelp::CmdHelp ()
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-int CmdHelp::execute (const std::string&, std::string& output)
+int CmdHelp::execute (std::string& output)
 {
   ViewText view;
   view.width (context.getWidth ());