Merge branch 'bugfix/silence-clang-yaspgrid-warnings' into 'master'

Steffen Müthingrequested to merge
cherry-pick-202e3872 into releases/2.6

[yaspgrid] Silence lots of compiler warnings in clang

See merge request !270 (merged)

(cherry picked from commit 202e3872)

f4c11fb6 [yaspgrid] Silence lots of compiler warnings in clang

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