preparation for non-queries

some docs in the lexer
bump the version to 0.5.0
add placeholder files for the planned initial non query support

tools/Language/SQL/SimpleSQL/SQL2011Bits.lhs

@@ -0,0 +1,15 @@
+
+Sections 16, 17, 18 and 19 in Foundation
+
+This module covers the tests for control statements (call and return),
+transaction management (begin, commit, savepoint, etc.), connection
+management, and session management (set).
+
+
+> module Language.SQL.SimpleSQL.SQL2011Bits (sql2011BitsTests) where
+
+> import Language.SQL.SimpleSQL.TestTypes
+
+> sql2011BitsTests :: TestItem
+> sql2011BitsTests = Group "sql 2011 bits tests" []
+