The DataProcessor Function Update

* Added new functions kwh, round, splitMax and splitMin
* Fixed a number of bugs in the dataProcessor
* Labels can now handle newlines \n in text
* Bug fix in Label when the value of a datapoint other than the first
was used
* SingleValueWidget bug fix so that their value can be > 100
* Added getlatest.php to get timestamp of latest input update (not used
yet)