Document the change to NCONF.

     of two sections.

     [Bernd Matthes <mainbug@celocom.de>, Steve Henson]

  *) NCONF changes.

     NCONF_get_number() has no error checking at all.  As a replacement,

     NCONF_get_number_e() is defined (_e for "error checking") and is

     promoted strongly.  The old NCONF_get_number is kept around for

     binary backward compatibility.

     Make it possible for methods to load from something other than a BIO,

     by providing a function pointer that is given a name instead of a BIO.

     For example, this could be used to load configuration data from an

     LDAP server.

     [Richard Levitte]

  *) Fix typo in get_cert_by_subject() in by_dir.c

     [Jean-Marc Desperrier <jean-marc.desperrier@certplus.com>]