task/ta-npe-mapper-04 -- mapper daemoniser facility

doc/source/modules/mapperdaemon.rst
nparcel/mapperdaemon.py
nparcel/tests/test_mapperdaemon.py
* new files
task/ta-npe-mapper-04 -- prepare mapper config items

nparcel/b2cconfig.py
nparcel/conf/nparceld.conf
* support for pe_in_dir_names and pe_in_file_format attributes