Add disable-tests flag to avoid dependency of test modules.
Move sample codes into another package.

--HG--
rename : schema-th/pgTest/PgTest.hs => relational-join-HDBC-pgTest/pgTest/PgTest.hs
rename : schema-th/pgTest/PgTestDataSource.hs => relational-join-HDBC-pgTest/pgTest/PgTestDataSource.hs
rename : schema-th/pgTest/runCreate.sh => relational-join-HDBC-pgTest/pgTest/runCreate.sh
rename : schema-th/pgTest/runDrop.sh => relational-join-HDBC-pgTest/pgTest/runDrop.sh
rename : schema-th/sample/1/Group.hs => relational-join-HDBC-pgTest/sample/1/Group.hs
rename : schema-th/sample/1/Membership.hs => relational-join-HDBC-pgTest/sample/1/Membership.hs
rename : schema-th/sample/1/README => relational-join-HDBC-pgTest/sample/1/README
rename : schema-th/sample/1/User.hs => relational-join-HDBC-pgTest/sample/1/User.hs
rename : schema-th/sample/1/create.sh => relational-join-HDBC-pgTest/sample/1/create.sh
rename : schema-th/sample/1/drop.sh => relational-join-HDBC-pgTest/sample/1/drop.sh
rename : schema-th/sample/1/querySample.hs => relational-join-HDBC-pgTest/sample/1/querySample.hs