More merge's from Dr. George's sourec tree

src/extend/array/array_iterator.c

src/extend/array/array_iterator.doc

src/extend/array/array_iterator.sql

src/extend/datetime/datetime_functions.c

src/extend/datetime/datetime_functions.doc

src/extend/datetime/datetime_functions.sql

src/extend/pginsert/Makefile

src/extend/pginsert/halt.c

src/extend/pginsert/halt.h

src/extend/pginsert/pginsert.c

src/extend/pginsert/pginterface.c

src/extend/pginsert/pginterface.h

src/extend/soundex/soundex.c

src/extend/soundex/soundex.sql

src/extend/string/string_io.c

src/extend/string/string_io.sql