fix test in DefineConstant of strings (the variable existence was tested in the map of numbers instead of strings, leading to a definition in all cases)

add explicit FixOrientation() when creating surface filling - it seems to fix some problematic cases

TODO: we need to better understand why ShapeFix is needed at all here, and what it really does

Issue meshing cylindrical surface

See merge request !199

Fix for previously committed test. The first triangle is deleted, so recur_tag won't hit any other triangles and thus all triangles will be deleted.

Addition of test which now fails to generate a mesh due to using the meshGeneratorPeriodic instead of the meshGenerator algorithm. The fix will be committed later.

new Mesh.MedFileMinorVersion option to select which minor version of the MED format to use when writing a new MED file

[no ci]

[ci skip]

- faq on geo commands that trigger a model sync

small bug in the 2D delaunay : ensuring that no vertex has never 3 neighboring triangles should be done at a post-pro stage