Adding a new plotopt "box" in DCubePlotter.py

The goal is to implement a new option "box" allowing to plot 2D ART plots as box/color histograms, not only as "lego" plots. See https://its.cern.ch/jira/browse/ATLIDTRKCP-157

This merge request affects 1 package:

• Tools/DCubeClient

added Tools master review-pending-level-1 labels

CI Result FAILURE (hash 7658c20d)

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

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AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 10333]

Unrelated CI failure. Please ignore.

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit daebcdcf

added sweep:ignore label