Reduce the days to display
Changes in dataqueries to adress Issue #6

Building up an array to store the day, the average moisture and the
amount of given water, if a watering event took place.
Changes in building the moistchart Issue #6

Adding a secondary vertical axis.
Changes in chart customization.
Minor changes adressing Issue #6

Now the days to be displayed in the moisture popup box are taken from
the moistdata.php
Reduction of the time label for the tempchart.