- no longer use an URL for the source, since the tarball is generated

- set the _service to localonly

- work around systemd-udev warnings, by moving comments in the
udev rules file to the beginning of a line.

- Build the info file only, no PS/PDF documentation.
- Don't require libftdi for older SUSE versions.

- Build from svn snapshot (last official release is too old).
- avrdude-use-serial-device-for-serbb.patch is no longer needed.
- Add UDB IDs for Arduino Leonardo and LUFA ACM bootloaders.
- Give access to programmer devices only to local users.
- Build documentation from source instead of importing pre-built
html and pdf documentation.
- Disable documentation building on releases older than 12.3 due
to texinfo problems.