Patch: 4 tooltip bugs (#6211)
Patch: 4 tooltip bugs (#6211)

* Order tooltip by yaxis by default

solves #6174

* typo

* Avoid sorting multiple times

and evaluate series.yaxis.n as it may not exist.

* typo

* typo

* typo

* Tooltip values loose their format when reordered

solves #6208

* Hover the correct point

* Make tooltip sort happy with hidden series

grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana