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/CmdModify.cpp

@@ -48,7 +48,7 @@ CmdModify::CmdModify ()
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-int CmdModify::execute (const std::string&, std::string& output)
+int CmdModify::execute (std::string& output)
 {
   int count = 0;
   std::stringstream out;