[8475] fixed some gcc-warnings

all warnings from Wunused
and some from Wall

cause unused may be most interesting for some:
they were in following files:
src/game/Level2.cpp
src/game/Map.cpp
src/game/SpellAuras.cpp
src/game/Unit.cpp
src/mangosd/Master.cpp
but i guess mostly someone just fogot to remove this code

for some unsigned vs signed warnings i used:
ack "for.*int .*size\(\)" | ack -v uint

also note for coding:
if you do something like
    if( a && b || c)
just place parentheses around (a && b) && always will have
precedence over || but without parentheses this could be overseen
quite fast (at least that's my guess why gcc will warn for this)

Signed-off-by: balrok <der-coole-carl@gmx.net>

src/game/GuildHandler.cpp

@@ -1076,7 +1076,7 @@ void WorldSession::HandleGuildBankSwapItems( WorldPacket & recv_data )
         recv_data >> unk2;                                  // always 0
         recv_data >> SplitedAmount;
 
-        if (BankTabSlotDst >= GUILD_BANK_MAX_SLOTS || BankTabDst == BankTab && BankTabSlotDst == BankTabSlot)
+        if (BankTabSlotDst >= GUILD_BANK_MAX_SLOTS || (BankTabDst == BankTab && BankTabSlotDst == BankTabSlot))
         {
             recv_data.rpos(recv_data.wpos());               // prevent additional spam at rejected packet
             return;