do explicit put properties into the the Ewoms::Properties namespace anymore

instead, do it implicitly by using the BEGIN_PROPERTIES and
END_PROPERTIES macros.

examples/co2injection_immiscible_ecfv.cpp

@@ -34,14 +34,15 @@
 
 #include "problems/co2injectionproblem.hh"
 
-namespace Ewoms {
-namespace Properties {
+BEGIN_PROPERTIES
+
 NEW_TYPE_TAG(Co2InjectionImmiscibleEcfvProblem,
              INHERITS_FROM(ImmiscibleModel,
                            Co2InjectionBaseProblem));
 SET_TAG_PROP(Co2InjectionImmiscibleEcfvProblem, SpatialDiscretizationSplice,
              EcfvDiscretization);
-}}
+
+END_PROPERTIES
 
 ////////////////////////
 // the main function