Changes for component-wise include of VTK in Lemma.

CMakeLists.txt

-if (VTK_SUPPORT)
+if (LEMMA_VTK_SUPPORT)
 	include_directories(${CMAKE_INSTALL_PREFIX}/include)
 
 	include_directories( "${CMAKE_CURRENT_SOURCE_DIR}/include" )
 
 	install ( TARGETS fem4ellipticpde DESTINATION ${CMAKE_INSTALL_PREFIX}/lib )
 
-	if (LEMMABUILDEXAMPLES)
+	if (LEMMA_BUILD_EXAMPLES)
 		add_subdirectory(examples)
 	endif()
 else()