data.php external API: Add dataset which returns Simtricity flow tokens for each site
data.php external API: Add dataset which returns Simtricity flow tokens for each site

The site_extra_info table now has the flow tokens and the webapp site codes.
The flow tokens are manually entered into the table as I don't yet know how to extract them
from the Simtricity API.

bec-uk/bec_fault_mon,bec-uk/bec_services,bec-uk/bec_services,bec-uk/bec_fault_mon,bec-uk/bec_fault_mon,bec-uk/bec_services