1.5.0 Option of worked examples for appropriate statistical tests

Written for SOFA Statistics by Grant Paton-Simpson on 2019-05-15

Adds option of worked examples for the following statistical tests:
* Mann-Whitney U
* Wilcoxon's Signed Ranks
* Spearman's Rho
* Pearson's Chi Square
Can choose number of decimal places to show in report tables and charts.
Can display counts or percentage separately on pie charts.
Better smoothed line displayed for line charts.
Easier to run generated scripts for testing (only need to set use_locally boolean).
Better visual separation of subtables.
Charts can show N.
Improvements to darker themes.
Add ability to define table to automatically open on startup (using open_on_start setting in projs/default.proj).
Ask users if they want to override existing project if adding new project with an already-used name.
Upgraded to newer GUI library (wxPython 4.0).
Added new safeguards and user feedback when problems converting output to images.
Dropped support for xls (xlsx is supported alongside tsv, csv, ods etc)
Dropped support for CUBRID (largely because drivers for newer versions of Python are not available)

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