branch: reorganize verbose options
`git branch -v` before:
fc/branch/nice-verbose
4761939 [ahead 1] branch: reorganize verbose options
`git branch -v` after:
fc/branch/nice-verbose
4761939 [master] branch: reorganize verbose options
Showing the upstream tracking branch is more important than how many commits
are ahead/behind, after all you need to know ahead/behind compared to _what_.
So now `git branch -v` shows the upstream, but not the tracking info, and
`git branch -vv` shows all information (unchanged).
An additional benefit is that `git branch -v` is now much faster:
Before:
git branch -v 1.28s user 0.02s system 99% cpu 1.299 total
After:
git branch -v 0.01s user 0.01s system 87% cpu 0.019 total
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>