$ bzr diff -r 4..7 | diffstat
 .bzrignore       |    2 +
 MANIFEST         |    2 -
 setup.py         |   28 ++++++++++++++++++++++
 surl/services.py |   70 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 surl/surl.py     |    4 +--
 5 files changed, 98 insertions(+), 8 deletions(-)
$ bzr diff -r 4..7 | grep '^+' | grep -v '^+++' | wc -l
98
$ bzr diff -r 4..7 | grep '^-' | grep -v '^---' | wc -l
8
$ bzr diff -r 4..7 | grep '^===' | wc -l
5