Removing support for Python 3.8, 3.9, 3.10. If you have downloaded/installed libeCalc manually, you will need to
run with at least Python 3.11 from now on.
CONTROL_MARGIN and CONTROL_MARGIN_UNIT are required for compressors, except for simplified compressor trains.
CONTROL_MARGIN and CONTROL_MARGIN_UNIT not allowed for simplified compressor trains.
Simplified trains have to use generic charts. Single speed- and variable speed charts are not allowed.