New version of POL Vault + Save shortcut in the right menu of the application

Hi,

Here is a pull request for a new version of PlayOnLinux Vault

The first commit is adding the new version (the version simply add lzop compression support if available thanks to Wolfgang Hartmann)

The second and the fird commit add a shortcut in the right menu to launch POL Vault with the current application.

Feel free to add only the first commit if you don't want the last ones.