Improve ip country detection (especially make it work for ipv6 users)

In block_partners we do country detection using a country table - and this is replicated on local_hub too (badly - with no data source defined) and possibly in other sites we've not found yet.

Some problems with this:

• It doesn't work with IPv6
• It requires the big country ip table to be copied onto each site
• No idea how accurate it is.

We should find a better way of doing it (even if its just making it one webservice used by all community sites)