Need to extend autoconf to support user setting.

strdup(), strcasecmp(), strncasecmp().  Should test to see
if these are truely needed.  Hopefully their addition will
not break other platforms.

This will allow us to substitute malloc() at a later date.

Added new developer todo list.

Don't support ./.ldaprc...  can be spoofed to easily.

Sync portable.h.nt with portable.h.in

Add ac/bytes.h to provided sized types.
Use new sized type in md5/sha1 header through simple typedef.
Should substitute old type for new everywhere.