Adjust data range feature may be incorrectly decimating data

[MisterMartin]

The recently added "adjust data range" on the instrument page plots seems to be decimating too much data. For instance, on the default zoom for an instrument with 1 minute data, the high chart plot only has a data point every hour.

Also, there are times that the high chart plot doesn't load at all. It may be that it is just taking a very long time.

This is in the current development release. It hasn't been merged into master yet.