Properties header file for [MM] columnxylene

This should include all of the changes required to separate the properties into a dedicated properties header file for the columnxylene problem in MM lecture.

See lecture#18 and dumux#858 (closed)

lecture/mm/columnxylene/CMakeLists.txt

@@ -13,5 +13,6 @@ dune_add_test(NAME columnxyleneexercise
 #install sources
 install(FILES
 columnxyleneproblem.hh
+columnxyleneproperties.hh
 columnxylenespatialparameters.hh
 DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/lecture/mm/columnxylene)