task/ta21b-01 -- factor out update and create from nparcel/dbsession.py
to nparcel/loader.py
nparcel/loaderdaemon.py

* fixed dumb error when trying to sort list from get_files() method
task/ta21b-02 -- integrate existing connote check

nparcel/loader.py
* update update() method so that it incorporates the existing connote
  check
Merge branch 'feature/us21b' into dev
Merge branch 'dev' into feature/us22
task/ta22-24 -- factor out BU_MAP to the config file

nparcel/conf/nparceld.conf
* new "file_bu" section to replace the BU_MAP global

nparcel/config.py
* update to support the new "file_bu" section

nparcel/loader.py
* replace BU_MAP global with configured "file_bu"

nparcel/loaderdaemon.py
* initialise a Loader() object with file_bu argument (taken from config)