Task #8437: Do not set user id during build, to avoid having to add one. Also, do not run apt-get upgrade as that is unnecessary.

Task #8437: Add CEP4 support for pipelines, add MAC/Services carrying PipelineControl.py supporting docker and slurm.

Task #8887: Fixed bug in CMakeLists.txt. The add_subdirectory() command MUST be placed AFTER the python_install() command. Otherwise __init__.py will not be properly symlinked, which will result in failing tests, because 'import lofar.common' will import nothing.

Task #9337: Call MeasurementSetFormat destructor under lock, and catch more AipsErrors to prevent OutputProc from terminating over a single MS

Task #9386: We cant evaluate "$COMMAND" and run it if it starts with KEY=VALUE pairs. Fixed by prepending with "env"