When some projects have migrated from Subversion to Git, there
were several tags that were treated as new commits, which shows
a change in the whole project (code added/removed) when nothing
really happened. For instance, in GNOME a lot svn tags were
catched during the migration, but not all of them.
svn tags in git repositories brings bad stats because double count
commits, and in project with a lot history it may may involve several thousands of source of lines of code.
Signed-off-by: Germán Póo-Caamaño <gpoo@gnome.org>