De-fuckup the /help command handler.

- Put "/help " (with a space after it) in the history so that it's useful.
- Don't return the usage as an error, or the chat entry field
  won't clear. What the fucking fuck? Seriously, there was a 3-fucking-line
  comment in here about doing the right thing and someone ignored it
  and made it do the wrong thing.

SK has been doing the wrong thing in response to chat errors, and now I worry
that games that used to do the right thing have changed to do things
incorrectly because the fucking help command has been fucked up for 2 years.

core/src/main/java/com/threerings/crowd/chat/client/ChatDirector.java

@@ -1185,6 +1185,9 @@ public class ChatDirector extends BasicDirector
         public String handleCommand (SpeakService speakSvc, String command,
                                      String args, String[] history)
         {
+            // put "/help " in the history
+            history[0] = command + " ";
+
             String hcmd = "";
 
             // grab the command they want help on
@@ -1203,20 +1206,24 @@ public class ChatDirector extends BasicDirector
 
             // handle "/help help" and "/help someboguscommand"
             Map<String, CommandHandler> possibleCommands = getCommandHandlers(hcmd);
+            String usage;
             if (_handlers.get(hcmd) == this || possibleCommands.isEmpty()) {
-                return getUsage(command);
+                usage = getUsage(command);
 
             } else if (possibleCommands.size() > 1) {
-                return getUsage(command, possibleCommands);
+                usage = getUsage(command, possibleCommands);
+
+            } else {
+                // if there is only one possible command display its usage
+                Map.Entry<String, CommandHandler> entry =
+                    possibleCommands.entrySet().iterator().next();
+                usage = entry.getValue().getUsage(entry.getKey());
             }
 
-            // if there is only one possible command display its usage
-            Map.Entry<String, CommandHandler> entry =
-                possibleCommands.entrySet().iterator().next();
             // this is a little funny, but we display the feedback message by hand and return
             // SUCCESS so that the chat entry field doesn't think that we've failed and
             // preserve our command text
-            displayFeedback(null, entry.getValue().getUsage(entry.getKey()));
+            displayFeedback(null, usage);
             return ChatCodes.SUCCESS;
         }