Merge branch 'feature/rot-symmetry-example' into 'master'
Feature/rot symmetry example
See merge request !2039 (merged)
(cherry picked from commit 84c6fb82)
219e7879 [examples] implement rotation-symmetric example 297e729b [examples][rotationsymmetry] add images and more docu 34bbeecc [examples][rotsym] add structural elements and compile docu