rebase: clear merge when aborting before any rebasing (
issue4661)
The check of the inrebase function was not correct, and it failed to
consider the situation in which nothing has been rebased yet, *and*
the working dir had been updated away from the initial revision.
But this is easy to fix. Given the rebase state, we know exactly where
we should be standing: on the first unrebased commit. We check that
instead. I also took the liberty to rename the function, as "inrebase"
doesn't really describe the situation: we could still be in a rebase
state yet the user somehow forcibly updated to a different revision.
We also check that we're in a merge state, since an interrupted merge
is the only "safe" way to interrupt a rebase. If the rebase got
interrupted by power loss or whatever (so there's no merge state),
it's still safer to not blow away the working directory.
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