Added -llber 'N' ber_printf format which inserts a NULL if

Added -llber 'N' ber_printf format which inserts a NULL if
an internal flag set.  Used for SEQUENCE testing.  Flag must
be set using debugger.  Modified ber_printf to use new format
were needed for extensibility testing.

Added first cut -lldap support for extended responses.
Modified ldapsearch(1) to handle v3 search references when not
chasing.  Also added extended/unsolicited notification handling
and extended partial response handling.  Changes include a
number of LDIF enhancements.

Fixed getpassphrase() returns NULL bugs