psql: Split up "Modifiers" column in \d and \dD

contrib/earthdistance/expected/earthdistance.out

contrib/postgres_fdw/expected/postgres_fdw.out

contrib/test_decoding/expected/ddl.out

doc/src/sgml/ref/create_index.sgml

doc/src/sgml/ref/psql-ref.sgml

src/bin/psql/describe.c

src/interfaces/ecpg/test/compat_informix/test_informix2.pgc

...faces/ecpg/test/expected/compat_informix-test_informix2.c

src/test/regress/expected/alter_table.out

src/test/regress/expected/collate.linux.utf8.out

src/test/regress/expected/collate.out

src/test/regress/expected/copy2.out

src/test/regress/expected/create_index.out

src/test/regress/expected/create_table_like.out

src/test/regress/expected/create_view.out

src/test/regress/expected/foreign_data.out

src/test/regress/expected/inherit.out

src/test/regress/expected/insert.out

src/test/regress/expected/matview.out

src/test/regress/expected/polymorphism.out