|author||Jason Evans <email@example.com>||Tue Nov 15 13:07:53 2016 -0800|
|committer||Jason Evans <firstname.lastname@example.org>||Tue Nov 15 13:08:33 2016 -0800|
Add extent serial numbers. Add extent serial numbers and use them where appropriate as a sort key that is higher priority than address, so that the allocation policy prefers older extents. This resolves #147.