PostgreSQL support

Here's a feature.pgsql file:

CREATE TABLE feature (
  fid serial PRIMARY KEY,
  name varchar(255) NOT NULL default '',
  details varchar(255) NOT NULL default '',
  image varchar(255) NOT NULL default '',
  description text
);

ALTER TABLE feature ADD category numeric(2,0);
ALTER TABLE feature ALTER category SET NOT NULL;
ALTER TABLE feature ALTER category SET DEFAULT '0';