Experimental DB pool + fixed stat overflow on equips

Implemented EXPERIMENTAL DBCP (connection pool), trying to improve
concorrent access to DB. Added door portals on Kerning Square. Fixed
equipments getting stat overflow when upgrading stats. Fixed expiring
pets crashing the client in some cases.

tools/MapleIdRetriever/lib/fetch.txt

@@ -1,26 +1,14 @@
-Dark Crystal Ore
-DEX Crystal Ore
-LUK Crystal Ore
-Power Crystal Ore
-Wisdom Crystal Ore
-Dark Crystal
-DEX Crystal
-LUK Crystal
-Power Crystal
-Wisdom Crystal
+Orihalcon Platine (M)
+Helios
 
-Mana Elixir
-Elixir
-Power Elixir
+Green Neli Shoes
+Kage
 
-Reindeer Milk
-Sunrise Dew
-Sunset Dew
+Green Pris (M)
+Golden Raven
 
-Silver Rover
-Mithril Husk
-Gold Eyes
-Blue Lorin
-Brown Lorin
-Steel Pow
-Black Bisk
+Brown Pireta Hat
+Dragon's Tail
+
+Red Martier
+White Fangz

tools/MapleIdRetriever/lib/result.txt

@@ -1,26 +1,14 @@
-4004004 
-4004002 
-4004003 
-4004000 
-4004001 
-4005004 
-4005002 
-4005003 
-4005000 
-4005001 
 
-2000006 2000018 2022177 
-2000004 2000012 2002012 2022175 2022456 
-2000005 2000019 2002013 2022176 2022457 
+1412009 1412016 1412020 1412025 
 
-2020013 
-2020014 
-2020015 
+1072207 
+1382008 1382024 1382029 1382034 
 
-1082096 
-1082104 
-1082107 
-1082099 
-1082098 
 
-1082204 
+1462012 
+
+1002327 
+1332023 1332037 1332042 1332047 
+
+1082210 
+1482011