[9339] Use group ids for indexing groups in DB

[newsbot]

<pre>m sql/characters.sql
+ sql/updates/9339_01_characters_group.sql
m sql/updates/Makefile.am
m src/game/CharacterHandler.cpp
m src/game/Group.cpp
m src/game/ObjectMgr.cpp
m src/game/ObjectMgr.h
m src/game/Player.cpp
m src/game/World.cpp
m src/shared/revision_nr.h
m src/shared/revision_sql.h

[9339] Use group ids for indexing groups in DB

* Use group ids in DB
* Pack used group ids at server startup
* Finaly drop group search by leader guid.</pre>



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