[Alexandria-list] New providers - British Library, etc

[Liam Davison]

Hi Laurent

Another little bug report. Z39.50 sources don't have a website (well,
they probably do but Alexandria doesn't know about them), it doesn't
make sense to include them in the 'Display Online Information' menu.
Nothing bad happens, but it's not good UI to have menu options which
don't do anything!

Liam
-- 
liam at liamjdavison.info