pgsphere - pgsphere: - remove btree index # speed up index query

Log Message:
-----------
- remove btree index
# speed up index query performance
# fix PostgreSQL 8.4 compatibility
# fix compiler warning "function input not used"

Modified Files:
--------------
pgsphere:
Makefile (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/Makefile?r1=1.3&r2=1.4)
sscan.c (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/sscan.c?r1=1.1.1.1&r2=1.2)
gist.c (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/gist.c?r1=1.2&r2=1.3)
pgs_euler.sql.in (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/pgs_euler.sql.in?r1=1.1.1.1&r2=1.2)
pgs_gist.sql.in (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/pgs_gist.sql.in?r1=1.2&r2=1.3)
sscan.l (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/sscan.l?r1=1.1.1.1&r2=1.2)
pgsphere/doc:
pg_sphere.xml (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/doc/pg_sphere.xml?r1=1.4&r2=1.5)
install.sgm (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/doc/install.sgm?r1=1.3&r2=1.4)
indices.sgm (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/doc/indices.sgm?r1=1.2&r2=1.3)
pgsphere/expected:
init.out (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/expected/init.out?r1=1.1.1.1&r2=1.2)
pg_sphere.out (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/expected/pg_sphere.out?r1=1.1.1.1&r2=1.2)
poly.out (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/expected/poly.out?r1=1.2&r2=1.3)
pgsphere/sql:
init.sql (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/sql/init.sql?r1=1.1.1.1&r2=1.2)

Added Files:
-----------
pgsphere/doc:
appendixes.sgm (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/doc/appendixes.sgm?rev=1.1&content-type=text/x-cvsweb-markup)

Removed Files:
-------------
pgsphere:
btree.c
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/btree.c)
pgs_btree.sql.in
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgsphere/pgsphere/pgs_btree.sql.in)