Migrate code from Piddle to Pillow

* wqflask/wqflask/marker_regression/display_mapping_results.py: Add font files
(DisplayMappingResults): Update the code from the Piddle way of things to the
Pillow way of things, for example, replace:
- pid.drawRect(...) with im_drawer.rectangle(...)
- pid.drawString(...) with im_drawer.text(...)
- pid.drawPolygon(...) with im_drawer.polygon(...) etc.
* wqflask/utility/Plot.py: Migrate code from the older, unsupported Piddle to
the newer Pillow library.

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