Implemented access to nested JSON objects as values for charts #1625
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This is the code to implement #1471
Code to access objects by path was taken from the solution of
https://stackoverflow.com/questions/6491463
When JSON objects are used to load chart data, nested / inner objects and
arrays can now be loaded, too.
See additional tests in spec/data-spec.js for examples, how to access nested
JSON object values
I also changed the negative precision of some tests because I think they didn't make sense.