Teach wmllint to fix a common WML typo, "agression" for "aggression".

data/campaigns/Descent_Into_Darkness/scenarios/03_A_Haunting_in_Winter.cfg

@@ -60,7 +60,7 @@
         fog=yes
         shroud=no
         [ai]
-            agression=0.6
+            aggression=0.6
             grouping=offensive
             recruitment_pattern=mixed fighter,fighter
         [/ai]

data/campaigns/Descent_Into_Darkness/scenarios/04_Beginning_of_the_Revenge.cfg

@@ -65,7 +65,7 @@
         fog=no
         shroud=no
         [ai]
-            agression=0.5
+            aggression=0.5
             caution=0.1
             villages_per_scout=8
             village_value=0.5

data/campaigns/Descent_Into_Darkness/scenarios/08_A_Small_Favor2.cfg

@@ -45,7 +45,7 @@
         no_leader=yes
         [ai]
             village_value=0
-            agression=0.8
+            aggression=0.8
         [/ai]
     [/side]
 

data/campaigns/Descent_Into_Darkness/scenarios/09_A_Small_Favor3.cfg

@@ -44,7 +44,7 @@
         no_leader=yes
         [ai]
             village_value=0
-            agression=0.8
+            aggression=0.8
         [/ai]
     [/side]
 

data/tools/wmllint

@@ -104,7 +104,7 @@
 # the spelling exceptions apply to all files below the parent
 # directory.
 #
-# A coment containing "no spellcheck" disable spellchecking on the
+# A coment containing "no spellcheck" disables spellchecking on the
 # line where it occurs.
 
 import sys, os, re, getopt, string, copy, difflib, time
@@ -116,6 +116,8 @@ linechanges = (
         ("canrecruit=1", "canrecruit=yes"),
         ("canrecruit=0", "canrecruit=no"),
         ("generate_description", "generate_name"),
+        # Fix a common typo
+        ("agression=", "aggression="),
         # These changed just after 1.5.0
         ("[special_filter]", "[filter_attack]"),
         ("[wml_filter]", "[filter_wml]"),