D22023: Don't allow variable names equal to function or constant names

[Alexander Semke]

asemke accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R262 LabPlot

REVISION DETAIL
  https://phabricator.kde.org/D22023

To: Murmele, asemke
Cc: kde-edu, narvaez, apol
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