Converted MySQL migration history to the new format

Replaced all NNN_StoreName.sql migration resources with a more
readable, single-file-per-store

OpenSim/Data/MySQL/Resources/FriendsStore.migrations

@@ -0,0 +1,25 @@
+:VERSION 1       # -------------------------
+
+BEGIN;
+
+CREATE TABLE `Friends` (
+	`PrincipalID` CHAR(36) NOT NULL, 
+	`Friend` VARCHAR(255) NOT NULL, 
+	`Flags` VARCHAR(16) NOT NULL DEFAULT 0, 
+	`Offered` VARCHAR(32) NOT NULL DEFAULT 0, 
+	PRIMARY KEY(`PrincipalID`, `Friend`), 
+	KEY(`PrincipalID`)
+);
+
+COMMIT;
+
+:VERSION 2       # -------------------------
+
+BEGIN;
+
+INSERT INTO `Friends` SELECT `ownerID`, `friendID`, `friendPerms`, 0 FROM `userfriends`;
+
+COMMIT;
+
+
+