- merged two pkg files (wr_streamers and wr_transmission) into one, i.e.
  a moved the stuff from wr_transmission into wr_streamers and removed
  wr_transmission_pkg.vhd file
- added simulation header in proper place, i.e. ./sim/
- modified build_wb.sh script adapting it to "kind-of convesion" used in wr-cores