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/CmdMerge.cpp

@@ -47,7 +47,7 @@ CmdMerge::CmdMerge ()
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-int CmdMerge::execute (const std::string&, std::string& output)
+int CmdMerge::execute (std::string& output)
 {
   std::string file = trim (context.task.get ("description"));
   std::string pushfile = "";
@@ -93,7 +93,7 @@ int CmdMerge::execute (const std::string&, std::string& output)
       context.task.set ("description", uri.data);
 
       std::string out;
-      context.commands["push"]->execute ("", out);
+      context.commands["push"]->execute (out);
     }
   }
   else