Docs: Add some information about how the CleanupCharacterDB-option in

the configfile works, and how to use it (properly).

--HG--
branch : trunk

doc/CharacterDBCleanup.txt

@@ -0,0 +1,33 @@
+ The purpose of the CharacterDB cleanup routines is to remove old, non- 
+existent and erranous/defunct skills, talents, spells, and achievements 
+from characters in the database.
+
+ To achieve this, add an entry (number) in the worldstate-table 
+(id:20004), combining the following arguments (bitmasked):
+
+    CLEANING_FLAG_ACHIEVEMENT_PROGRESS  = 0x1
+    CLEANING_FLAG_SKILLS                = 0x2
+    CLEANING_FLAG_SPELLS                = 0x4
+    CLEANING_FLAG_TALENTS               = 0x8
+
+Example:
+ We want to clean up old talents, spells and skills, but leave 
+achivements alone - ie. NOT touching those. We'd then need to combine 
+the numbers from each of the above fields:
+
+  CLEANING_FLAG_SKILLS + CLEANING_FLAG_SPELLS + CLEANING_FLAG_TALENTS
+
+This comes out as 2+4+8 => 14, and we now put an entry in for this in 
+the worldstate table (this is done on the CHARACTERS database) :
+
+  UPDATE worldstates SET value=14 WHERE entry=20004;
+
+This will then (when the core is restarting) clean up old and missing
+skills, spells and talents.
+
+Please note that we are not responsible for any issues that might come 
+from this, and that you are (as the owner of the database), responsible 
+for doing proper backups prior to doing the above in case of anything 
+going wrong.
+
+-- The TrinityCore developer team