Merge branch 'fix/doc-debug' into 'master'

[doc][dev] Fix include to stdstreams.hh which defines the used symbols

See merge request !3708

doc/doxygen/pages/developing.md

@@ -70,7 +70,7 @@ for the whole project. You can choose five different levels of severity:
 They are used as shown in the following example
 
 ```cpp
-#include <dune/common/debugstream.hh>
+#include <dune/common/stdstreams.hh>
 // define the minimal debug level somewhere in your code
 #define DUNE_MINIMAL_DEBUG_LEVEL 4
 Dune::dgrave << "message"; // will be printed

dumux/freeflow/rans/zeroeq/problem.hh

@@ -15,6 +15,8 @@
 #include <string>
 
 #include <dune/common/math.hh>
+#include <dune/common/stdstreams.hh>
+
 #include <dumux/common/properties.hh>
 #include <dumux/common/staggeredfvproblem.hh>
 #include <dumux/discretization/localview.hh>

dumux/material/components/co2.hh

@@ -15,9 +15,11 @@
 #include <cmath>
 #include <iostream>
 
+#include <dune/common/stdstreams.hh>
 #include <dune/common/math.hh>
 
 #include <dumux/common/exceptions.hh>
+
 #include <dumux/material/constants.hh>
 #include <dumux/material/components/base.hh>
 #include <dumux/material/components/liquid.hh>

dumux/material/components/simpleco2.hh

@@ -13,6 +13,8 @@
 #ifndef DUMUX_SIMPLE_CO2_HH
 #define DUMUX_SIMPLE_CO2_HH
 
+#include <dune/common/stdstreams.hh>
+
 #include <dumux/common/parameters.hh>
 #include <dumux/material/idealgas.hh>