[9957] Alow sell item for money and extanded coset without momey in same time.

[newsbot]

<pre>m sql/mangos.sql
+ sql/updates/9957_01_mangos_mangos_string.sql
+ sql/updates/9957_02_mangos_npc_vendor.sql
m sql/updates/Makefile.am
m src/game/Creature.cpp
m src/game/Creature.h
m src/game/ItemHandler.cpp
m src/game/Level2.cpp
m src/game/ObjectMgr.cpp
m src/game/ObjectMgr.h
m src/game/Player.cpp
m src/shared/revision_nr.h
m src/shared/revision_sql.h

[9957] Alow sell item for money and extanded coset without momey in same time.

npc_vendor.ExtandedCost can be negative now that meaning:
price excluded default item BuyPrice and use only abs(ExtandedCost) items).
For example expected used for item 36908.</pre>



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