pgsql-server: Give inet/cidr datatypes their own hash function that

Log Message:
-----------
Give inet/cidr datatypes their own hash function that ignores the inet vs
cidr type bit, the same as network_eq does. This is needed for hash joins
and hash aggregation to work correctly on these types. Per bug report
from Michael Fuhr, 2004-04-13.
Also, improve hash function for int8 as suggested by Greg Stark.

Modified Files:
--------------
pgsql-server/src/backend/access/hash:
hashfunc.c (r1.39 -> r1.40)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/hash/hashfunc.c.diff?r1=1.39&r2=1.40)
pgsql-server/src/backend/utils/adt:
network.c (r1.51 -> r1.52)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/adt/network.c.diff?r1=1.51&r2=1.52)
pgsql-server/src/include/catalog:
catversion.h (r1.234 -> r1.235)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/catalog/catversion.h.diff?r1=1.234&r2=1.235)
pg_amproc.h (r1.48 -> r1.49)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/catalog/pg_amproc.h.diff?r1=1.48&r2=1.49)
pg_proc.h (r1.336 -> r1.337)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/catalog/pg_proc.h.diff?r1=1.336&r2=1.337)
pgsql-server/src/include/utils:
builtins.h (r1.242 -> r1.243)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/builtins.h.diff?r1=1.242&r2=1.243)
inet.h (r1.17 -> r1.18)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/inet.h.diff?r1=1.17&r2=1.18)
pgsql-server/src/test/regress/expected:
opr_sanity.out (r1.53 -> r1.54)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/expected/opr_sanity.out.diff?r1=1.53&r2=1.54)
pgsql-server/src/test/regress/sql:
opr_sanity.sql (r1.42 -> r1.43)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/sql/opr_sanity.sql.diff?r1=1.42&r2=1.43)