better customization for MPI launcher

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'devel' of github.com:ULHPC/launcher-scripts into devel

# By Fotis Georgatos (2) and Xavier Besseron (1)
# Via Fotis Georgatos
* 'devel' of github.com:ULHPC/launcher-scripts:
  added wsub
  added scoop
  Dummy change
load only /etc/profile

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Add example directory and helloworld MPI

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'devel' of github.com:ULHPC/launcher-scripts into devel

# By Fotis Georgatos
# Via Fotis Georgatos
* 'devel' of github.com:ULHPC/launcher-scripts:
  add URL for ctest and beautify