Merge policy into node. Needs database reset, or the following commands:

Merge policy into node. Needs database reset, or the following commands:

alter table policy rename to pre_policy;
create table if not exists policy
                          ( node   integer,
                            key    text,
                            value  text,
                            primary key (node, key)
                            foreign key (node)
                            references nodes(node)
                            on update cascade
                            on delete cascade );

insert into policy select n.node, p.key, p.value from nodes n, pre_policy p where n.path = p.path;
drop table pre_policy;

Refs #1165
Refs #1167