*Fix usage of EffectValueMultiplier in spell code.

*Remove some obsolete code from spell class.
*Rename some spellmod and dbc column names to be more accurate.

--HG--
branch : trunk

src/server/game/Entities/Unit/Unit.h

@@ -111,14 +111,14 @@ enum SpellModOp
     SPELLMOD_JUMP_TARGETS           = 17,
     SPELLMOD_CHANCE_OF_SUCCESS      = 18,
     SPELLMOD_ACTIVATION_TIME        = 19,
-    SPELLMOD_EFFECT_PAST_FIRST      = 20,
+    SPELLMOD_DAMAGE_MULTIPLIER      = 20,
     SPELLMOD_GLOBAL_COOLDOWN        = 21,
     SPELLMOD_DOT                    = 22,
     SPELLMOD_EFFECT3                = 23,
-    SPELLMOD_SPELL_BONUS_DAMAGE     = 24,
+    SPELLMOD_BONUS_MULTIPLIER       = 24,
     // spellmod 25
     SPELLMOD_PROC_PER_MINUTE        = 26,
-    SPELLMOD_MULTIPLE_VALUE         = 27,
+    SPELLMOD_VALUE_MULTIPLIER       = 27,
     SPELLMOD_RESIST_DISPEL_CHANCE   = 28,
     SPELLMOD_CRIT_DAMAGE_BONUS_2    = 29, //one not used spell
     SPELLMOD_SPELL_COST_REFUND_ON_FAIL = 30