Merge branch 'master' into VERSION_file_removal

src/OpenMesh/Core/Utils/PropertyManager.hh

@@ -593,6 +593,17 @@ class PropertyManager {
             src.copy_to(src_range, dst, dst_range);
         }
 
+        /**
+         * Mark whether this property should be stored when mesh is written
+         * to a file
+         *
+         * @param _persistence Property will be stored iff _persistence is true
+         */
+        void set_persistent(bool _persistence = true)
+        {
+          mesh().property(getRawProperty()).set_persistent(_persistence);
+        }
+
     private:
         void deleteProperty() {
             if (!retain_ && prop_.is_valid())

src/Unittests/CMakeLists.txt

@@ -30,6 +30,8 @@ if ( OPENMESH_BUILD_UNIT_TESTS )
     if (TARGET Eigen3::Eigen)
       add_definitions( -DENABLE_EIGEN3_TEST ) 
       link_libraries(Eigen3::Eigen)
+    else()
+      message(WARNING "Eigen3 not found! This will skip the Eigen3 Unittests. You can point cmake to Eigen3 by setting Eigen3_DIR to the cmake files of Eigen3")
     endif()
 
     if ( CMAKE_GENERATOR MATCHES "^Visual Studio 11.*" )