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Description of problem:
boolean fields are currently stored in the db as char(1) columns.  The expected
value is either '0' or '1'.  As such, the ddl generator should add check
constraints to the ddl to ensure that '0' and '1' are the only possible values
entered.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. open ddl/{oracle-se,postgres}/table-cat_categories-auto.sql
2. 
3.
    

Actual Results:  create table cat_categories (
    category_id INTEGER not null
        constraint cat_categori_catego_id_p_yeprq
          primary key,
        -- referential constraint for category_id deferred due to circular
dependencies
    description VARCHAR(4000),
    name VARCHAR(200) not null,
    url VARCHAR(200),
    enabled_p CHAR(1) not null,
    abstract_p CHAR(1) not null,
    default_ancestors VARCHAR(3209) not null
);


Expected Results:  create table cat_categories (
    category_id INTEGER not null
        constraint cat_categori_catego_id_p_yeprq
          primary key,
        -- referential constraint for category_id deferred due to circular
dependencies
    description VARCHAR(4000),
    name VARCHAR(200) not null,
    url VARCHAR(200),
    enabled_p CHAR(1) not null
        constraint <constraint_name> 
        check(enabled_p in ('0','1')),
    abstract_p CHAR(1) not null
        constraint <constraint_name> 
        check(abstract_p in ('0','1')),
    default_ancestors VARCHAR(3209) not null
);


Additional info: