New upstream feature release 0.4

Written for Jockey by Martin Pitt on 2008-05-20

The spirit of this release is to enable working with third-party driver packages and remote driver databases.

 * Implements an XML-RPC client for querying a driver database, as specified on this year's LinuxFoundation Collaboration Summit. There is no server implementation for this yet, though.

 * Add general support for third-party repositories and packages not yet known to the local system. In the course of this, the functionality of DriverPackageHandler became merged into the generic Handler class, and ModulePackageHandler became obsolete (KernelModuleHandler now does all of this). This made the code a bit shorter and easier, too.

 * Lots of bug fixes.

 * Add support for python-coverage in the test suite, and add a lot of missing tests.