Changes made to resolve GratiaWeb Request-56
(replace @ with , for csv output): the changes
made for this issue were:
/src/gratia/config/gratia_bar_queries.xml:
  line 1190: <pivot_transform>displayNameSite --> displayNameCommaSite
/src/gratia/database/query_handler.py:
  lines added: 433-440 - for the addition of a new
pivot_transform function using comma as the delimeter.