* Removed useless obsolete targets (setup.py based)
* Merged version templating in Makefile (removed bin/gen_changelog*).
* Added 'release' make target that generates a dist/*.tar.gz official
  versionned release tarball from which one can just use setup.py,
  dpkg-buildpackage or rpmbuild (no Makefile in it).
* Removed obsolete bin/lint as well.
* Now the 'rpm' and 'deb' Makefile targets use the generated release build.
* Makefile commands now use no echo mode.
* Added timestamps for virtual targets.
* Removed obsolete (empty) doc packages generation. The shell is
  self-documenting.
* Cleaned up setup.py alignements.