Map local guids 6.x -> 4.3.4

Ported the following commits:
https://github.com/TrinityCore/TrinityCore/commit/ca83e14f8b141fab0a13e08f48fca6c1ace0c4c7
https://github.com/TrinityCore/TrinityCore/commit/ee1c1b97be4492ecabe8b15ea6323fc37e4eaa8c
https://github.com/TrinityCore/TrinityCore/commit/18e4ab6911468b829b0fc768e532a770263c3717
https://github.com/TrinityCore/TrinityCore/commit/bf37446b3c2ed73b4d3aa9e227d3eff5c53b378b
https://github.com/TrinityCore/TrinityCore/commit/cb854a2b7bb7bd96cf9c4d1daf3789f797bf4db8

sql/updates/characters/2015_08_26_00_characters_from_335.sql

@@ -0,0 +1,18 @@
+-- Keep only the highest guid PvE or PvP (not bones) corpse per player guid
+DELETE c FROM `corpse` c LEFT JOIN
+(
+    SELECT MAX(`guid`) AS id
+    FROM `corpse`
+    WHERE `corpseType` IN (1,2)
+    GROUP BY `guid`
+) corpsetemp
+ON c.`guid` = corpsetemp.`id`
+WHERE corpsetemp.`id` IS NULL;
+
+ALTER TABLE `corpse_phases`
+  DROP PRIMARY KEY,
+  DROP `Guid`,
+  DROP `CorpseType`,
+  DROP `Time`,
+  CHANGE `OwnerGuid` `OwnerGuid` int(10) unsigned NOT NULL DEFAULT '0' FIRST,
+  ADD PRIMARY KEY (`OwnerGuid`, `PhaseId`);