all threads.

header doesn't precisely match the return of db_version().

of ldap_start_tls_s().

remove syncrepl stuff from Operation struct

LDAP_OPT_X_TLS_CONNECT_CB and LDAP_OPT_X_TLS_CONNECT_ARG
with int (LDAP_TLS_CONNECT_CB) (LDAP *ld, SSL *ssl, SSL_CTX *ctx, void *arg)
To be called whenever the client library allocates a new SSL* handle.

instead of recycling thru avl_find/avl_delete/avl_insert