t / t5100 / info0018on commit status: add --[no-]ahead-behind to status and commit for V2 format. (fd9b544)
   1Author: Another Thor
   2Email: a.thor@example.com
   3Subject: This one contains a tab and a space
   4Date: Fri, 9 Jun 2006 00:44:16 -0700
   5