pgsql: Preventing intersection of ranges during page split.

Log Message:
-----------
Preventing intersection of ranges during page split. Changes are only
optimization, so don't backpatch.

Modified Files:
--------------
pgsql/contrib/btree_gist:
btree_cash.c (r1.9 -> r1.10)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_cash.c?r1=1.9&r2=1.10)
btree_date.c (r1.7 -> r1.8)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_date.c?r1=1.7&r2=1.8)
btree_float4.c (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_float4.c?r1=1.8&r2=1.9)
btree_float8.c (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_float8.c?r1=1.8&r2=1.9)
btree_inet.c (r1.10 -> r1.11)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_inet.c?r1=1.10&r2=1.11)
btree_int2.c (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_int2.c?r1=1.8&r2=1.9)
btree_int4.c (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_int4.c?r1=1.8&r2=1.9)
btree_int8.c (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_int8.c?r1=1.8&r2=1.9)
btree_interval.c (r1.12 -> r1.13)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_interval.c?r1=1.12&r2=1.13)
btree_macaddr.c (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_macaddr.c?r1=1.8&r2=1.9)
btree_oid.c (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_oid.c?r1=1.8&r2=1.9)
btree_time.c (r1.16 -> r1.17)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_time.c?r1=1.16&r2=1.17)
btree_ts.c (r1.17 -> r1.18)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_ts.c?r1=1.17&r2=1.18)
btree_utils_var.c (r1.21 -> r1.22)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/btree_utils_var.c?r1=1.21&r2=1.22)