Better logging and statistics

[trichner]

Print out better statistics about Grids, which schems were placed how many times? which schems did never get placed? Which sizes got placed? Which contexts?

[israelcurtis]

we really need at least a simple version of this -- right now we have no real way of knowing if all our builds are actually getting placed at all. looking at the map is not reliable. Just a simple log showing first - all the schems the gen found and cached -- then a log showing how many times each one got placed so we can tell if there's a problem with one