ENOSPC overhaul

Hello,

I'm going to be going through our ENOSPC handling to make it simpler and fixing the various performance problems and too early problems we have been seeing. I'm going to target these for 3.2, but I'm going to post them as I churn them out so people can review them and test them. Please respond to this email with your pet-ENOSPC test, I want to make sure we are in good standing when the merge window opens for 3.2 so we don't ever have to worry about this problem again (at least in the big general sense that we have had to in the past). Thanks,

Josef