Added initial set of expected outputs for new regression testing.

src/test/regress/expected/aggregates.out

src/test/regress/expected/alter_table.out

src/test/regress/expected/arrays.out

src/test/regress/expected/btree_index.out

src/test/regress/expected/hash_index.out

src/test/regress/expected/int2.out

src/test/regress/expected/int4.out

src/test/regress/expected/oidint2.out

src/test/regress/expected/oidint4.out

src/test/regress/expected/polygon.out

src/test/regress/expected/portals.out

src/test/regress/expected/portals_p2.out

src/test/regress/expected/purge.out

src/test/regress/expected/random.out

src/test/regress/expected/select.out

src/test/regress/expected/select_views.out

src/test/regress/expected/transactions.out