Moves moveme.back to the position after tohere.back and dec both ranges.
Probably not safe to use either range afterwards, but who knows.
Preconditions: moveme and tohere are both ranges of the same container
Postconditions: moveme.back is decremented
Complexity: O(1)
Moves moveme.back to the position after tohere.back and dec both ranges. Probably not safe to use either range afterwards, but who knows. Preconditions: moveme and tohere are both ranges of the same container Postconditions: moveme.back is decremented Complexity: O(1)