Rebase: allow to add "--no-verify"

When rebasing, using the rebase button or interactive D&D rebase,

it would be useful to optionally skip commit verification (as per the --no-verify flag, and consistently with the default behavior of git rebase -i).

That is because some commits in the history, for technical reasons, sometimes have to not pass the commit verification. For instance a commit containing a patch file must be allowed to have trailing whitespaces.

Currently this prevents to use the interactive rebase feature, as moving a commit around the non-conforming commit will cause an unsolvable error. Doing the same thing using "git rebase -i" works just fine.