rewrote sockbuf_buf_init macro not to expand its argument multiple times.

lber: ifdef'ed out lber_..set_nonblock() function because it used ioctl's.
  If it remains, it needs to be written to support various methods for
  setting non-blocking.  ioctls should probably be last choice.  configure
  could detect existance of fcntl(), ioctl(), etc.
bdb2:
  added .dsp/.dsw files and did some basic cleanup (still needs work).

2. Make ldbm_Env a failure-safe entity.

LDAP v3 MODDN request.

carry it. This in preparation to support LDAP v3 MODDN
request.

int add_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
int delete_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
int replace_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
to
int bdb2i_add_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
int bdb2i_delete_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
int bdb2i_replace_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
So that ldbm and db2 backends can coexist.

int add_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
int delete_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
int replace_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
to
int bdb2i_add_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
int bdb2i_delete_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
int bdb2i_replace_values LDAP_P(( Entry *e, LDAPMod *mod, char *dn ));
So that ldbm and db2 backend can coexist

8.9 style configuration via MAILER(mail500).

same code (commented out).

v3 MODDN (MODRDN) operation on the client side.

a MODDN or MODRDN request depending on the newSuperior parameter.

ldapmodrdn so that it can take the newparent parameter. (Check -s option)

utility functions added to support the modrdn v3 implementation.
These parse and rdn of the form "attribute_type = attribute_value"
returning "attribute_type" and "attribute_value" respectively.

are needed in the implementation of modrdn v3.

used in implementing modrdn v3.

construction which may be useful later when adding new tags. This
in preparation to support moddn v3.