Fixing MeasurementController for precipitation query. The fieldArray was not filled correctly
Precipitation Data no longer comes with a measure_time field for each Measurement object. I have changed arrayDateTimeObj so it adds 12:00:00 as a generic time when this field is missing
The new precipitation query is super fast now, no more looping required and no more table joins.

Signed-off-by: Christian Rapp <0x2a@posteo.org>
Added a big animated gif. Using this one as progress indicator when querying data for charts
Removed date and time column from data model and database table. Replaced it with one datetime column which is much better, especially grouping works over different timeframes than hours, days.

Signed-off-by: Christian Rapp <0x2a@posteo.org>