Some improvements

I've implemented some of the improvements and hopefully query performance is much better; certainly the home page is much faster now. There are some additional optimizations contemplated but those are going to have to wait for awhile.

Good news and bad news...

The good news is, the performance of the harvester/geotagger has been radically improved, which has allowed many more books to be added to the system (up to around 46,000!).

The bad news is, this has led to some slower query times on the site. You may be seeing that it takes quite a long time to load the map with icons, or for the tagcloud of locations to be painted in. I understand what's going on - some of the queries I wrote were a bit naive and unscalable. I have corrections in mind - will try to get them in soon.....