Graphs: date range doesn't work when selecting "Cloud timestamp"

[cdupont]

If I enter two dates in "date from" and "date to" on the graph page, and select "Cloud timestamp", the data downloaded is still based on the device timestamp, not the Cloud timestamp.

[cdupont]

With this page:
http://dashboard.waziup.io/sensors/LUMS_NODE_1/SM2
When selecting two dates, this is the request that is issued:

https://api.waziup.io/api/v1/sensors/LUMS_NODE_1/measurements/SM2/values?lastN=100&dateFrom=2016-05-03T10:00:00Z&dateTo=2019-02-15T11:00:00Z

I think lastN should be removed. A high limit should be put instead.

[cdupont]

See also bad behavior of lastN: Waziup/api-server#52

[cdupont]

A simple solution is to add a field "number of datapoints" in the query form. This field corresponds to limit.

[cdupont]

Still get difficulty selecting a time range.