HttT balance for snow terrain change

changelog

@@ -9,6 +9,7 @@ SVN trunk (1.1.1+svn):
      * switched over to [music] from music=
      * minor gameplay improvement for Swamp of Dread
      * new story art
+     * Northern Winter - added turns for balancing
    * The Rise of Wesnoth
      * Updated path information
    * Eastern Invasion

data/campaigns/Heir_To_The_Throne/scenarios/Northern_Winter.cfg

@@ -6,7 +6,7 @@
 	[music]
 	name="wesnoth-1.ogg"
 	[/music]
-	{TURNS 33 30 27}
+	{TURNS 50 40 40}
 
 	{DAWN}
 	{MORNING}
@@ -47,12 +47,12 @@
 	[story]
 		[part]
 		story= _ "Across the river were lands few humans had ever visited. The occasional distant peal of orcish drums made the abundant pine forests nestled in rolling foothills both breathtaking and ominous."
-		background="maps/wesnoth.png"
+		background="maps/wesnoth-bw.jpg"
 		show_title=no
 		[/part]
 		[part]
 		story= _ "Swirling, snow-laden winds tore at Konrad's army, signaling the final exit of autumn and the onset of what would be a harsh winter."
-		background="maps/wesnoth.png"
+		background="maps/wesnoth-bw.jpg"
 		show_title=no
 		[/part]
 	[/story]

data/campaigns/Heir_To_The_Throne/utils/intro.cfg

@@ -27,7 +27,7 @@
 	[/part]
 	[part]
 	story= _ "Eldred made war upon Delfador and his forces with his mother's advice ringing in his ears: 'Fight no one great or small except the old mage, whose head should be severed from his shoulders.'"
-	background=maps/wesnoth.png
+	#background=maps/wesnoth.png
 	[/part]
 	[part]
 	story= _ "And Eldred did indeed meet Delfador face-to-face in battle that day. Sword clashed against staff, as the wise old mage fought the brash young warrior."