Removes "->" lines from `git bb` output

`bb` = `better branch` or `branch branch`
Allows passing arguments to `git bb`

They were previously being passed to `awk` (instead of being passed to
`git branch`).
Prevents rerunning tests for `pending` cukes

Was retrying if `doretry` was set and the `retrylog` file was empty.
Instead, retry if `doretry` was set and the cukes failed.