added a comment about the add-apt-repository in the linux section
fixed time unit usage (microseconds for RT_ macros)
- hotfix for include-prototype-order problem
Merge remote-tracking branch 'codeplex_ahlen/master' into forstudents
Merge remote-tracking branch 'origin/forstudents'
Merge branch 'master' into lab1

* master:
  - hotfix for include-prototype-order problem
  fixed time unit usage (microseconds for RT_ macros)
  added a comment about the add-apt-repository in the linux section