INSERT IGNORE INTO does not work for postgres

Hello Claude,

I'm starting to learn github.  It will probably be better for me in the long run. (github seems popular :-) )
I'm sending you pull requests for the patches I've made and mailed you earlier.

This one is for the bug with postgresql.

I'll send the other (optional gwgd-url-shortener) as a separate pull request.
I'm also planning to make a dutch translation. 

Best regards,
Jan