redid attribution button to use the builtin ZopeAttributionButton method.

PrincipiaTime and ZopeRedirect for PrincipiaRedirect.

dates like 1/2/3 and Oct 1, 2.

This satisfies the ZPL attribution clause.

The test for the cancel button was case sensitive.
I changed it so it would accept any case, as well as extra spaces.

constructor.

Changed code to defer getting column meta data until a
table is expanded.

(e.g. DAs with missing or incorrect binaries.)

Also, we now import products before opening the database.
This gives products a chance to try to fix things up that
may hurd old pickles.

(e.g. DAs with missing or incorrect binaries.)