SABnzbd 0.5.2RC1 changelog

SABnzbd 0.5.2RC1 brings the following changes:

- Fixed: Large queue caused very slow UI and high memory usage
- Fixed: Some very large rar sets failed to unpack
- Fixed: garbled emails were sent
- Python user scripts now run properly on OSX
- Fixed: SeasonSort could produce trailing spaces in paths, which fail on Windows
- Fixed: unpacking errors not properly reported to user script
- Keep trying when receiving garbage from nzbmatrix.com
- Add total-size fields to API-call History.
- Auto-search for free port when specified port is occupied
- Improve reporting of newzbin errors