postgres-lambda-diff

changes to the SQL to retrieve attributes for older versions of Postgres is
probably wise.  Also, please make sure that I have mapped the storage types
to the correct storage names, as this is relatively poorly documented.

I think that this patch might need to be considered for back-porting to
7.3.3 since at the moment, people will be losing valuable information after
upgrades.

Will dump:

CREATE TABLE test (
    a text,
    b text,
    c text,
    d text
);
ALTER TABLE ONLY test ALTER COLUMN a SET STATISTICS 55;
ALTER TABLE ONLY test ALTER COLUMN a SET STORAGE PLAIN;
ALTER TABLE ONLY test ALTER COLUMN b SET STATISTICS 1000;
ALTER TABLE ONLY test ALTER COLUMN c SET STORAGE EXTERNAL;
ALTER TABLE ONLY test ALTER COLUMN d SET STORAGE MAIN;

Christopher Kings-Lynne