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

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

ebos/eclwellmanager.hh

@@ -50,10 +50,13 @@
 #include <string>
 #include <vector>
 
-namespace Ewoms {
-namespace Properties {
+BEGIN_PROPERTIES
+
 NEW_PROP_TAG(Grid);
-}
+
+END_PROPERTIES
+
+namespace Ewoms {
 
 /*!
  * \ingroup EclBlackOilSimulator