diff: add --stat for diffstat output
diff/qdiff --stat invokes patch.diffstat() on the diff output.
When in interactive mode, the output's maximum width is determined by the
terminal's width.
adding a
adding b
adding c
adding d
adding dir/bar/foo
adding dir/x
adding dir/y
adding e
% inserve
? hg.pid
% clean
C a
C b
C c
C d
C dir/bar/foo
C dir/x
C dir/y
C e
% all
? hg.pid
C a
C b
C c
C d
C dir/bar/foo
C dir/x
C dir/y
C e
% path patterns
M dir/x
? hg.pid
M dir/x
M x
% issue 1375
adding h/h
adding hg.pid
removing h/h
A h
R h/h
M a
merging a
1 files updated, 1 files merged, 2 files removed, 0 files unresolved
M a
3 files updated, 1 files merged, 0 files removed, 0 files unresolved
M a