Updates to external yaml-cpp for shared library build

CMake/FindUmfpack.cmake

 endif(UMFPACK_LIBRARIES)
 
 include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(UMFPACK DEFAULT_MSG
+find_package_handle_standard_args(Umfpack DEFAULT_MSG
                                   UMFPACK_INCLUDES UMFPACK_LIBRARIES)
 
 mark_as_advanced(UMFPACK_INCLUDES UMFPACK_LIBRARIES AMD_LIBRARY COLAMD_LIBRARY CHOLMOD_LIBRARY SUITESPARSE_LIBRARY)

CMake/SuperBuild.cmake

         ExternalProject_Add(EIGEN
 	    GIT_REPOSITORY "https://gitlab.com/libeigen/eigen.git"
         UPDATE_COMMAND "" 
-	    GIT_TAG "3.3.7" #"default"
+	    GIT_TAG "3.3.7" 
    	    PREFIX ${CMAKE_CURRENT_BINARY_DIR}/external/eigen
    	    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}
 		#CONFIGURE_COMMAND ""
         PATCH_COMMAND ""
         PREFIX ${CMAKE_CURRENT_BINARY_DIR}/external/yaml-cpp
         CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX} 
-                   -DBUILD_SHARED_LIBS=${BUILD_SHARED_LIBS}
+                   -DYAML_BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} 
                    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} 
     	           -DYAML_CPP_BUILD_TESTS=OFF
                    -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}

CMakeLists.txt

 if (VTK_FOUND)
     set(volumeRenderer volumerenderer.cxx)
 	add_definitions(-DLEMMAUSEVTK) 
+	if (LEMMA_VTK8_SUPPORT)
+    add_definitions(-DLEMMA_VTK8_SUPPORT)
+    else (LEMMA_VTK9_SUPPORT) 
+    add_definitions(-DLEMMA_VTK9_SUPPORT)
+    endif()
 endif()
 
 if (LEMMA_BUILD_DOCUMENTATION)