Remove Previous Gear Tuning (#797)

- removed the custom setting PreviousGearTuning
- removed computedHealingAdjustment
- removed checkIPProgression(player) on PlayerMapChanged
- excluded accounts now also get adjustment checks on login.
- now using an aura for HP adjustments

conf/individualProgression.conf.dist

@@ -103,18 +103,6 @@ IndividualProgression.TBCHealthAdjustment = 1
 #
 IndividualProgression.QuestXPFix = 1
 
-# IndividualProgression.PreviousGearTuning
-#
-#        Description: Reduces the power of previous expansion end-game gear when entering the next expansion for leveling.
-#                     This resolves a balancing problem where players would not get any useful gear until near the end of the leveling experience,
-#                     as well as overpowering the leveling content. This is particularly true in TBC leveling due to the strength of Naxx 40 gear.
-#                     Set to 0 (0% adjustment) to disable
-#
-#        Default:     0 - Disabled
-#                  0.01 - 1% reduced health and damage per previous expansion epic
-#
-IndividualProgression.PreviousGearTuning = 0
-
 # IndividualProgression.RequireNaxxStrathEntrance
 #
 #        Description: If enabled, this will require players to first enter Naxx 40 through the original beta entrance in the back of Stratholme,