Remove the terminal option from config.

The welcome message is displayed using xmessage(1), not using your
terminal. Thus, it makes no sense to have this option anymore. Also,
the new lex/yacc parser cannot correctly handle the situation:
normal variables are expanded before parsing the file. As a replacement,
you can use:
  set $terminal /usr/bin/urxvt

docs/userguide

@@ -178,10 +178,6 @@ and edit it with a text editor.
 
 === General configuration
 
-terminal::
-	Specifies the terminal emulator program you prefer. It will be started
-	by default when you press Mod1+Enter, but you can overwrite this. Refer
-	to it as +$terminal+ to keep things modular.
 font::
 	Specifies the default font you want i3 to use. Use an X core font
 	descriptor here, like

i3.config

@@ -1,11 +1,6 @@
 # This configuration uses Mod1 and Mod3. Make sure they are mapped properly using xev(1)
 # and xmodmap(1). Usually, Mod1 is Alt (Alt_L) and Mod3 is Windows (Super_L)
 
-# Tell i3 about your preferred terminal. You can refer to this as $terminal
-# later. It is recommended to set this option to allow i3 to open a terminal
-# containing the introduction on first start.
-terminal /usr/bin/urxvt
-
 # ISO 10646 = Unicode
 font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
 

src/cfgparse.y

@@ -486,8 +486,8 @@ exec:
 terminal:
         TOKTERMINAL WHITESPACE STR
         {
-                config.terminal = sstrdup($<string>3);
-                printf("terminal %s\n", config.terminal);
+                LOG("The terminal option is DEPRECATED and has no effect. "
+                    "Please remove it from your configuration file.");
         }
         ;
 

src/config.c

@@ -597,7 +597,6 @@ void load_configuration(xcb_connection_t *conn, const char *override_configpath,
         }
         }
 
-        REQUIRED_OPTION(terminal);
         REQUIRED_OPTION(font);
 
         /* Set an empty name for every workspace which got no name */