Fix issues #3 and #38 on hydro-devel

* For issue #3 I just applied the patch that Dave posted in the issue with a minimal change required to make it compile and added the script provided by dornhege.
* For issue #38 I just find replace clearing_roatation_allowed by clearing_rotation_allowed, what fixes the problem, as Dave said.

I hope I didn't something stupid... as is my second pull request. Please tell me if so.