Panda3D downloads for several distros

After some stupid mistakes, the packaging is nearly ready. I changed the structure to comply with the Debian standards (I hope), now the build contains out of 4 packages: panda3d1.9.0, panda3d-dev, panda3d-samples and python-panda3d. Haven’t tested the builds, yet, so I don’t create packages on LP before I’m sure they will work.