(synced syncprov.c with HEAD)

+       Fixed slapo-syncprov MODs cause DELs (ITS#4423)
+       Fixed slapd slap_send_ldap_result bug (ITS#4499)
+       Fixed slapd-ldif deadlock (ITS#4500)
+       Fixed liblutil strtoul(3) usage (ITS#4503)
+       Updated ldapsearch(1) BASE output (ITS#4504)
+       Fixed slapd cn=config (ITS#4512)
+       Fixed slapd thread pool init issue (ITS#4513)
+       Fixed slapd cn=config olcLimits (ITS#4515)
+       Fixed slapd runqueue use of freed memory (ITS#4517)

Ready for release?

Changes needs updating for release...

ready for release

rebuild configure