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/CmdShell.h

@@ -35,7 +35,7 @@ class CmdShell : public Command
 {
 public:
   CmdShell ();
-  int execute (const std::string&, std::string&);
+  int execute (std::string&);
 };
 
 #endif