On join clients are now given a changelog notice, if the changelog has changed since last.

code/controllers/configuration.dm

@@ -194,6 +194,8 @@ var/list/gamemode_cache = list()
 
 	var/law_zero = "ERROR ER0RR $R0RRO$!R41.%%!!(%$^^__+ @#F0E4'ALL LAWS OVERRIDDEN#*?&110010"
 
+	var/aggressive_changelog = 0
+
 /datum/configuration/New()
 	var/list/L = typesof(/datum/game_mode) - /datum/game_mode
 	for (var/T in L)
@@ -638,6 +640,9 @@ var/list/gamemode_cache = list()
 				if("law_zero")
 					law_zero = value
 
+				if("aggressive_changelog")
+					config.aggressive_changelog = 1
+
 				else
 					log_misc("Unknown setting in configuration: '[name]'")