Bar charts and pie charts with a very large number of data points fail to display

[David Platten]

There is a default maximum number of items that a Highcharts plot will display. Trying to display more than this results in no plot being displayed.

http://api.highcharts.com/highcharts#plotOptions.series.turboThreshold

It is possible to increase the default of 1000 to a higher value.

This has caused an issue for me when plotting a plot of acquisition frequency where there are more than 1000 acquisition protocol names. It also affects the corresponding column plots of DAP, kVp and mAs.

[David Platten]

Increased maximum number of items that can be plotted. This issues does not affect the scatter plot as this uses simple x-y data points. Also declared some local variables in chartUpdateData.js to prevent them from being global. Fixes issue #408

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