of a busy wait and allow the pthread_yield within the loop to be
removed.  This was the only pthread_yield which was necessary
when usng non-preemptive threads.  As such, the configure.in
sched_yield/pthread_yield missing error can be removed from
configure.in.  If explicit yield function is missing, just provide
a no-op replacement.
Moved declaration of various slapd globals from main.c to init.c
so they can be shared with ldbm tools.

environmental variables.

Update Install document with testing step and other minor changes.

Added new developer todo list.

"Net Boolean Incorporated" and drop "Net Boolean" private
label.  This was done per agreement between the Foundation
and Net Boolean.   Long Live OpenLDAP!