Add experimental hunger setting (see issue number 37 and 228)

resolves #228, finishes one task in 37.

patches/subgame/minetest.server-example.conf

@@ -4,6 +4,14 @@
 motd = Actions and chat messages are logged. Use inventory to see recipes. Priveleges may be limited for new users, so ask a moderator to /grant priveleges.
 disallow_empty_passwords = true
 
+# (default 180, or 80 if enable_wonder is true; minimum is 10
+# see )
+hunger_tick = 216
+time_speed = 60
+day_time_speed = 60
+night_time_speed = 60
+
+
 # server_dedicated is added by the install script, true/false
 #   conditionally (see install script):
 # server_dedicated = false