Plot-dayly: no . at the end of the timestamp
Removed drawChart.php from index

This was the slowest plot and it seems as if it had exclusive lock all the time. By removing this plot the loadingtime of the index was significantly lowered
Fixed plot-monthly

It plottet 31 weeks instead of 4 weeks, now I entered the correct number.
plot: first set timeout, then begin transaction
Added fork-test
Calculate the sliding averages on upload instead of on graph

This is a great improve in performance when requesting the graphs after a long time of no requests. In addition it avoids racing-conditions when multible graph-skripts want to calculate the averages at the same time.

To avoid blocking the upload the populate-skript forks into backgroud before doing any work.