task/ta-npe-load-07 -- report range config

nparcel/conf/npmts.conf
* placeholder for the new "report_range" settings option

nparcel/mts.py
* new attribute "report_range"
* new method report range which reads config items from the
  configuration file
* updated the get_delivery_report_sql() method to include
  the new report_range attribute in SQL prearation