pgsql: /contrib/cube improvements: Update the calling convention for

Log Message:
-----------
/contrib/cube improvements:

Update the calling convention for all external facing functions. By
external facing, I mean all functions that are directly referenced in
cube.sql. Prior to my update, all functions used the older V0 calling
convention. They now use V1.

New Functions:

cube(float[]), which makes a zero volume cube from a float array

cube(float[], float[]), which allows the user to create a cube from
two float arrays; one for the upper right and one for the lower left
coordinate.

cube_subset(cube, int4[]), to allow you to reorder or choose a subset of
dimensions from a cube, using index values specified in the array.

Joshua Reich

Modified Files:
--------------
pgsql/contrib/cube:
CHANGES (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/CHANGES.diff?r1=1.2&r2=1.3)
README.cube (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/README.cube.diff?r1=1.7&r2=1.8)
cube.c (r1.26 -> r1.27)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/cube.c.diff?r1=1.26&r2=1.27)
cube.sql.in (r1.17 -> r1.18)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/cube.sql.in.diff?r1=1.17&r2=1.18)
uninstall_cube.sql (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/uninstall_cube.sql.diff?r1=1.2&r2=1.3)
pgsql/contrib/cube/expected:
cube.out (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/expected/cube.out.diff?r1=1.16&r2=1.17)
pgsql/contrib/cube/sql:
cube.sql (r1.8 -> r1.9)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/sql/cube.sql.diff?r1=1.8&r2=1.9)