crash testing, 1 export failure, 0 import failures

I graphed our crashtesting improvement on importing documents a while back, and mentioned that while import failures had improved dramatically that the export figures weren't as shiny. But there's been some great progress there too, especially with the work mstahl has been putting in, so today the crashtesting has reported effectively three consecrative 0 import failures and with the first drop to 1 reported export failure (an assert) so I present the graph of export failure progress

 And an updated import crashtesting graph.

This is on our corpus of 76000+ documents sucked down from various bugzillas and other sources.