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/CmdCustom.cpp

@@ -51,7 +51,7 @@ CmdCustom::CmdCustom (
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-int CmdCustom::execute (const std::string&, std::string& output)
+int CmdCustom::execute (std::string& output)
 {
   int rc = 0;
 
@@ -128,7 +128,6 @@ int CmdCustom::execute (const std::string&, std::string& output)
 
 ////////////////////////////////////
   // TODO Create the filter
-  context.args.remove_command (_keyword);
 
   //std::vector <std::string> filter_args;
   //context.args.extract_filter (filter_args);