which is so much simpler than the autofools setup it's not even funny

remove superflous logX functions

- LogStreams are now ostream derived
- function names have been lower cased
- idea to base Logger on dune dbg streams has been discarded because they are not ostream based
- streams and logger split into two header

adds now mandatory vc stamp and corresponding git attribute to ignore it on export (for tarballs, etc)