remove outdated plotting script

I used this years ago for debugging. It isn’t very helpful any more and doesn’t work with NUANCE-formatted output files, anyway.
SNEWS2 · Jun 16, 2020 · f986c3d · f986c3d
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commit f986c3d
Showing 1 changed file with 0 additions and 119 deletions.
diff --git a/verification_plots.py b/verification_plots.py