- Fixed key that was based on $index and no unique name (when you change...

Before: 
site1.value 0.085273
site1_packetloss.value 0
site2.value 0.056873
site2_packetloss.value 0

When you changed URL1, stats for old URL1 were still displayed.

Now:
wwwgooglecom.value 0.085273
wwwgooglecom_packetloss.value 0
wwwyahoocom.value 0.056873
wwwyahoocom_packetloss.value 0

Now stats is attached to URL, so if URL change, it will be a new stat.
Label can be changed without any problem.