[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/WaypointMovementGenerator.cpp

@@ -310,7 +310,7 @@ void FlightPathMovementGenerator::SetCurrentNodeAfterTeleport()
         return;
 
     uint32 map0 = i_mapIds[0];
-    for(int i = 1; i < i_mapIds.size(); ++i)
+    for (size_t i = 1; i < i_mapIds.size(); ++i)
     {
         if(i_mapIds[i]!=map0)
         {