Viks rename reports on squish billing page#19177

This resolves Task# 19177: Rename reports on squish billing page …
http://squish.ish.com.au/tasks/19177
The rows by columns caption has been added to the billing tables.
The caption now appears as Pivot Row filed by column filed
The "Date" option has been renamed to "Days of week" and a new "Date" option actually representing dates has been introduced.