task/ta-npe-002-23 -- factor out inline processing into the daemon.py
module

nparcel/based.py
* new method launch_command() which factors out the command execution

nparcel/utils/daemon.py
* new attribute inline
* modified the start() method to distinguish between inline and
  daemonisation

nparcel/bin/npcommsd
nparcel/bin/npexporterd
nparcel/bin/nploaderd
nparcel/bin/npprimaryelectd
* replace command selection with nparcel.utils.Daemon.launch_command()