Unicode fixes, torrent file checking

- Fixes for Unicode file names
- Provide checking of existing fiels against torrent hashes
Torrent data testing and minor fixes
Add DEBUG2 level and lots of inpection printing

- Add DEBUG2 level for really noisy debugging
- Add introspection to find about caller automatically.
Unicode fixes
First verson of GUI
Manager class to wrap torrent and aria in one class
Examples for using aria to download stuff
Typo...