Simple HelenOS coastline package installation

You can now easily install coastline packages in HelenOS using the 'pkg install' command. It will automatically download and install the latest build of the package from ci.helenos.org (you need your HelenOS box to be connected to the Internet, obviously).

Previously you would have to download the package, uncompress it (into .tar format) and copy it to the overlay directory in your source tree. Then you would have to rebuild the boot CD image and restart the system.