Merge branch 'rr/rebase-stash-store'

Finishing touches for the "git rebase --autostash" feature introduced earlier. * rr/rebase-stash-store: rebase: use 'git stash store' to simplify logic stash: introduce 'git stash store' stash: simplify option parser for create stash doc: document short form -p in synopsis stash doc: add a warning about using create