1.4.6 Adds time series line and area charts

Written for SOFA Statistics by Grant Paton-Simpson on 2016-01-01

Adds time series line and area charts.
Better error message when not enough values in group to run analysis e.g. ANOVA.
Better handling of precision in p-value results displayed.
Better handling of dates pre-1900.
Better messages to user about potentially excessive categories in charts.
Add support for float years as date values for time series.
Add support for specifying port connecting to postgresql.
Allows boxplots when fewer values to display.
Removed broken google docs integration - just as easy to manually download and import normally.
Removed two pop-ups - no longer needed.

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