Check out local branches that track remote

Let's say there's a branch at remotes/origin/foo, and no foo branch
locally.

`git checkout foo` will checkout a local branch set up to track the
remote foo branch.

I have never, ever wanted to do `git checkout remotes/origin/foo` and
get one of those weird non-local branches.

So, display branches as `remotes/origin/foo`, but then chop it down to
`foo` before passing to `git checkout`.

zshrc

@@ -520,7 +520,7 @@ gc(){
   if [[ $# == 0 ]]; then
     local branch=$(git branch -a --color=always |\
       fzf --reverse --ansi --tac |\
-      sed -E 's/^\*?[ \t]*//')
+      sed -E -e 's/^\*?[ \t]*//' -e 's@^remotes/[a-z]+/@@')
     [[ -n "$branch" ]] && git checkout "$branch" || true
   else
     git checkout "$@"