Support double hashtags (and double mentions) in newpostmsg

See 706f17869b (https://github.com/miguelfreitas/twister-html/pull/202) and 07edcd08a9 (https://github.com/miguelfreitas/twister-core/pull/295)

src/twister.cpp

@@ -1797,21 +1797,31 @@ Value newpostmsg(const Array& params, bool fHelp)
                             boost::algorithm::token_compress_on);
     BOOST_FOREACH(string const& token, tokens) {
         if( token.length() >= 2 ) {
+            char delim = token.at(0);
+            if( delim != '#' && delim != '@') continue;
+            string target = (delim == '#') ? "hashtag" : "mention";
             string word = token.substr(1);
 #ifdef HAVE_BOOST_LOCALE
             word = boost::locale::to_lower(word);
 #else
             boost::algorithm::to_lower(word);
 #endif
-            if( token.at(0) == '#') {
-                dhtPutData(word, "hashtag", true,
+            if( word.find(delim) == string::npos ) {
+                dhtPutData(word, target, true,
                                  v, strUsername, GetAdjustedTime(), 0);
-            } else if( token.at(0) == '@') {
-                dhtPutData(word, "mention", true,
+            } else {
+                vector<string> subtokens;
+                boost::algorithm::split(subtokens,word,std::bind1st(std::equal_to<char>(),delim),
+                                        boost::algorithm::token_compress_on);
+                BOOST_FOREACH(string const& word, subtokens) {
+                    if( word.length() ) {
+                        dhtPutData(word, target, true,
                                          v, strUsername, GetAdjustedTime(), 0);
                     }
                 }
             }
+        }
+    }
 
     hexcapePost(v);
     return entryToJson(v);