Prevent infocmp from spamming stdout when a new session is created. Fixes bug 1118.

PTYSession.m

@@ -435,7 +435,7 @@ static NSString* SESSION_ARRANGEMENT_WORKING_DIRECTORY = @"Working Directory";
         return;
     }
     NSString* cmd = [NSString stringWithFormat:@"tic -e xterm-256color %@", [filename stringWithEscapedShellCharacters]];
-    if (system("infocmp xterm-256color")) {
+    if (system("infocmp xterm-256color > /dev/null")) {
         switch (NSRunAlertPanel(@"Warning",
                                 @"The terminfo file for the terminal type you're using, \"xterm-256color\", is not installed on your system. Would you like to install it now?",
                                 @"Install",