Autofix whitespace inconsistencies

to have clean diffs later on
First attempt to make graphs work with timestamps
Make graphs interrupt line in null ranges

We send null values when we have no monitoring data available
and this will make the graphs interrupt the line in the no-data
ranges instead of showing false 0 values (The line will simply
be undefined in those ranges). Apart from making obviously
distinguishable when there are 0 values from when there are
actually no available data, this will save us from anomalies
in the range boundaries concerning metrics calculated with use
of derivatives.