Add SetParam() function.

Author: alja

src/XrdCl/XrdClURL.hh

@@ -277,6 +277,15 @@ namespace XrdCl
         ComputeURL();
       }
 
+      //------------------------------------------------------------------------
+      //! Set a single param
+      //------------------------------------------------------------------------
+      void SetParam( const std::string &name, const std::string &value )
+      {
+        pParams[name] = value;
+        ComputeURL();
+      }
+
       //------------------------------------------------------------------------
       //! Parse a string and fill the URL fields
       //------------------------------------------------------------------------