Update of contrib stuff from massimo.

contrib/array/Makefile

contrib/array/array_iterator.c

contrib/array/array_iterator.doc

contrib/array/array_iterator.h

contrib/array/array_iterator.sql.in

contrib/datetime/Makefile

contrib/datetime/datetime_functions.c

contrib/datetime/datetime_functions.h

contrib/datetime/datetime_functions.sql.in

contrib/miscutil/Makefile

contrib/miscutil/assert_test.c

contrib/miscutil/assert_test.h

contrib/miscutil/misc_utils.c

contrib/miscutil/misc_utils.h

contrib/miscutil/misc_utils.sql.in

contrib/pginterface/README.orig

contrib/pginterface/pginsert.c.orig

contrib/pginterface/pginterface.c.orig

contrib/pginterface/pgnulltest.c.orig

contrib/pginterface/pgwordcount.c.orig