Apply contrib patch from Massimo

contrib/Makefile

contrib/array/Makefile

contrib/array/array_iterator.c

contrib/array/array_iterator.doc

contrib/datetime/Makefile

contrib/datetime/datetime_functions.c

contrib/datetime/datetime_functions.doc

contrib/miscutil/Makefile

contrib/miscutil/misc_utils.c

contrib/miscutil/misc_utils.doc

contrib/string/Makefile

contrib/string/string_io.c

contrib/string/string_io.doc

contrib/userlock/Makefile

contrib/userlock/user_locks.c

contrib/userlock/user_locks.doc