adding the setuptools class from openembedded classic; adjusting the packages; adding legal statement

experimenting with a solution for the packaging with easyinstall that was suggested by Ross Burton on the oe mailing list

This reverts commit 11cd0706450150fb9a9e7e5df2eae08e9c525d0b.
For the moment, this feature is not used. Maybe a later iteration might extract the settings and use it.

This reverts commit aa0c0ec99370f6ffcd19e9c5f3c9cf1a7cf65a76.

the rospkg installation natively (in the installation script) is only required because the PYTHON_PATH is not set, which is not set because the easy_install.pth files are deleted

extending installation script so that it patches, compiles, installs and starts ROS; extending README