Benjamin Becker

@XinArkh I created a pull request that fixes the bugs you discovered. If you have some time, you can have a look at it and see if this is in...

For the fix I did not use `deepcopy`, but I create a new list [here](https://github.com/nathanlct/reeds-shepp-curves/blob/1f57635733e15f450dee97cffd57c4ebe564dc8f/reeds_shepp.py#L110) and [here](https://github.com/nathanlct/reeds-shepp-curves/blob/1f57635733e15f450dee97cffd57c4ebe564dc8f/reeds_shepp.py#L118). I also wrote a test which addresses the bug introduced by using `copy`...