use twister.conf argument to enable direct messages

src/twister_rss.cpp

@@ -72,12 +72,15 @@ int generateRSS(string uri, string *output)
     params2.push_back(max);
     params2.push_back(postSources);
     Array posts = getposts(params2,false).get_array();
+    vector<Object> outputVector;   
+    
+    if(GetBoolArg("-rss_dm",false))     //synchronizing direct messages is disabled by default
+    {
         Array params3;
         params3.push_back(account);
         params3.push_back(max);
         params3.push_back(postSources);
         Object messages = getdirectmsgs(params3,false).get_obj();
-    vector<Object> outputVector;   
               
         for(int j=0;j<messages.size();j++)
         {
@@ -109,6 +112,7 @@ int generateRSS(string uri, string *output)
                 }
             }
         }
+    }
         
     for(int i=0;i<posts.size();i++)
     {