Fixed libmdb leaf node handling (ITS#7266)
Fixed libmdb mutexes on Apple/Windows (ITS#7251)
Fixed slapd duplicate error response (ITS#7076)
+ Fixed slapd memory leaks with sync replication (ITS#7292)
Fixed slapd-bdb/hdb cache hang under high load (ITS#7222)
Fixed slapd-mdb with tool mode (ITS#7255)
Fixed slapd-mdb with approx indexing (ITS#7279)
+ Fixed slapo-accesslog memory leaks with sync replication (ITS#7292)
+ Fixed slapo-syncprov memory leaks with sync replication (ITS#7292)
Fixed contrib/sha2 portability (ITS#7267)
Fixed contrib/sha2 thread safety (ITS#7269)
Added contrib/sha2 {SSHA256}, {SSHA384}, {SSHA512} support (ITS#7278)