Dynamic loading, again

I created another table, ta_grid, for the same reason as the roadnodes and roadlinks, but this time for topographic areas. It processed 9789 topographic areas, created a total of 553518 records, and took about two and a half hours to run.

Sad thing is, it actually runs worse now, and doesn't seem to load some data at all. Probably just slowed down a lot (that's a lof of records to get through, however you look at it), but for now I'm taking it out again.

Might look at it again later.