task/ta-npi-016-01 -- log to different streams

nparcel/utils/log.py
* Some black magic to identify logger handlers based on the calling
  script

nparcel/utils/daemon.py
* daemoniser now closes all I/O streams except for the defined logging
  file handlers

nparcel/bin/npexporterd
nparcel/bin/npftp
nparcel/bin/nploaderd
* adjustments to support tailored logging streams