task/us173-ta169 -- Parse the ParcelPoint Report file fields

top/b2cconfig/exporterb2cconfig.py
top/exporter.py
top/b2cconfig/exporterb2cconfig.py
top/conf/top.conf
* refactor the various report header/values into dictionary attributes
  called exporter_headers and exporter_defaults

top/exporter.py
* refactor the parse_report_file() method to parse the exporter report
  files based on the new attributes