D16928: Do not show "+" for positive numbers if user do not want this

[Yuri Chornoivan]

yurchor marked an inline comment as done.

REPOSITORY
  R334 KmPlot

REVISION DETAIL
  https://phabricator.kde.org/D16928

To: yurchor, #kde_edu, broulik
Cc: cfeck, kde-edu, kde-doc-english, skadinna, narvaez, apol
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