863 adjust hets version checking

I've adjusted the version checking to the new schema.

This also changes the complain mechanism, in the future tests shouldn't fail just because the ubuntu-package
reports a version that is incompatible with the one provided inside the yml-file.

Also the hets-formula (homebrew for Mac OS X has been updated), feel free to update your hets version.
Take a look [here][1] for instructions.

[1]: https://github.com/0robustus1/homebrew-hets