More splits and cleanups...

src/test/regress/expected/create_aggregate.out

src/test/regress/expected/create_index.out

src/test/regress/expected/create_operator.out

src/test/regress/expected/create_view.out

src/test/regress/expected/misc.out

src/test/regress/expected/sanity_check.out

src/test/regress/input/create_misc.source

src/test/regress/output/create_misc.source

src/test/regress/sql/create_aggregate.sql

src/test/regress/sql/create_index.sql

src/test/regress/sql/create_operator.sql

src/test/regress/sql/create_view.sql

src/test/regress/sql/sanity_check.sql

src/test/regress/sql/tests