Filter abberations

[mstenta]

Sometimes sensors produce aberrations that are very very high or low, and cause the graph to become unreadable.

Add a condition to the select queries to ensure that all sensor readings that are displayed are within a reasonable range. Maybe make that range a setting so that it can be configured (in case different ranges are necessary).

Do not delete the abberations, in case debugging is required. Simply allow them to be filterer out of the final display.