*Correct implementation and use of dbc data for aura SPELL_AURA_CONVERT_RUNE(249)

*Fix Blood of the North, Reaping - original patch by thenecromancer
*Fix Death Rune Mastery.

--HG--
branch : trunk

src/game/SpellAuras.h

@@ -350,6 +350,8 @@ class TRINITY_DLL_SPEC AuraEffect
         uint32 GetEffIndex() const { return m_effIndex; }
         int32 GetBasePoints() const { return m_currentBasePoints; }
         int32 GetAuraAmplitude(){return m_amplitude;}
+        void ResetPeriodicTimer(){m_periodicTimer = m_amplitude;}
+
         virtual void Update(uint32 diff);
 
         uint32 GetTickNumber() const { return m_tickNumber; }