pgtreelib - pgtreelib: nested set model

Log Message:
-----------
nested set model

Modified Files:
--------------
    pgtreelib/src/main:
        crud_node.psql (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/crud_node.psql.diff?r1=1.6&r2=1.7)
        types.psql (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/types.psql.diff?r1=1.4&r2=1.5)
        trigger.psql (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/trigger.psql.diff?r1=1.2&r2=1.3)
        traversal.psql (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/traversal.psql.diff?r1=1.5&r2=1.6)
        casts.psql (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/casts.psql.diff?r1=1.4&r2=1.5)
        base.psql (r1.7 -> r1.8)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/base.psql.diff?r1=1.7&r2=1.8)
        schema.sql (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/schema.sql.diff?r1=1.6&r2=1.7)
        util.psql (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/util.psql.diff?r1=1.6&r2=1.7)
        traversal_level.psql (r1.4 -> r1.5)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgtreelib/pgtreelib/src/main/traversal_level.psql.diff?r1=1.4&r2=1.5)