aff9ccbade9ae74fb63becc842621eefef5abfa0
This is for 2.80 (though bug I mistakenly merged into was for 2.78. Duplicate bugs T58127, T58411, T58440, and T58789 all fixed. Bevel weights and crease are not real Mesh layers so get lost on coversion of mesh to bmesh unelss the mesh's cd_flag member tells the converter to create layers for them. Most code the copies or partially copies meshes uses mesh_new_nomain_from_template_ex, so copied the flag there.
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