Merge branch 'zj/diff-stat-dyncol'

Merge branch 'zj/diff-stat-dyncol'

By Zbigniew Jędrzejewski-Szmek (8) and Junio C Hamano (1)
* zj/diff-stat-dyncol:
  : This breaks tests. Perhaps it is not worth using the decimal-width stuff
  : for this series, at least initially.
  diff --stat: add config option to limit graph width
  diff --stat: enable limiting of the graph part
  diff --stat: add a test for output with COLUMNS=40
  diff --stat: use a maximum of 5/8 for the filename part
  merge --stat: use the full terminal width
  log --stat: use the full terminal width
  show --stat: use the full terminal width
  diff --stat: use the full terminal width
  diff --stat: tests for long filenames and big change counts