Log Message:
-----------
Split out inheritance major feature item in release notes.
Modified Files:
--------------
pgsql/doc/src/sgml:
release.sgml (r1.457 -> r1.458)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.457&r2=1.458)