Fill relation array with null to force relation to not be a jugged array
Ignore null on determination of the maximum/minimum value
Remove useless tuples which have only null as attributes

In the case of drawing a line chart for materials from log files of "Sandanshiki Kanpan", the data may cause line disconnection, because X-axis (date and time) may have null as Y-axis (quantity of materials).
It is really hard for us to stand all line disconnection.
Therefore, projected relation removes a tuple which have only null as attributes.
Replace tuple filtering as a way of interpolation with "interplateNulls" option of chart API
Correct an updating timing of a candlestick
Correct a way to sort date and time

The commit has no update of test, because JavaScript engines on Web browsers cannot reproduce WSH/JScript engine.
Improve comparison efficiency and make it less likely to be affected by language processor
Merge branch 'issue/10'