Add some 2nf transformations

sql/2nf/appearances.sql

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+begin;
+alter table "appearances" drop column "lgID";
+commit;

sql/2nf/appearancespost.sql

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+begin;
+create table if not exists appearancespost (
+	"yearID"	numeric,
+	"playerID"	text,
+	"teamID"	text,
+	primary key("yearID","playerID")
+);
+
+insert into appearancespost
+select distinct yearID, playerID, teamID
+from battingpost
+union
+select distinct yearID, playerID, teamID
+from pitchingpost;
+
+alter table "battingpost" drop column "teamID";
+alter table "battingpost" drop column "lgID";
+
+alter table "pitchingpost" drop column "teamID";
+alter table "pitchingpost" drop column "lgID";
+commit;

sql/2nf/homegames.sql

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+begin;
+alter table "homegames" drop column "league.key";
+commit;

sql/2nf/salaries.sql

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+begin;
+alter table "salaries" drop column "lgID";
+commit;

sql/2nf/seriespost.sql

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+begin;
+alter table "seriespost" drop column "lgIDwinner";
+alter table "seriespost" drop column "lgIDloser";
+commit;

sql/2nf/teamshalfdivision.sql

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+begin;
+create table if not exists "teamshalfdivisions" (
+	"yearID"	numeric,
+	"teamID"	text,
+	"divID"	text,
+	primary key("yearID","teamID")
+);
+
+insert into teamshalfdivisions
+select distinct yearid, teamid, divid
+from teamshalf;
+
+alter table teamshalf drop column "lgID";
+alter table teamshalf drop column "divID";
+commit;