Implementation coming soon.

an integer type of exactly 32 bits.

Still need object classes for both of these.  Suspect we'll need
to assign "experimental" ones from our arc.

loader, there for not allowing any modules with shared libraries
to be loaded.

Added support for external extensions (based on moduleload).  All new code is conditional on SLAPD_EXTERNAL_EXTENSIONS.

Rewrite to better support external modules hooking into slapd.  Added module_init() and module_kill() routines for startup and (clean) shutdown.

Load extension library on "extension" keyword in configs (actual load routine is in extended.c).  Protected by #ifdef SLAPD_EXTERNAL_EXTENSIONS.