Merge branch 'fix/inclusion-of-intrange' into 'master'

[staggered] include Dumux' IntRange if Dune doesn't provide it

See merge request !714

dumux/common/staggeredfvproblem.hh

@@ -27,6 +27,8 @@
 #include <dune/common/version.hh>
 #if DUNE_VERSION_NEWER(DUNE_COMMON,2,6)
 #include <dune/common/rangeutilities.hh>
+#else
+#include <dumux/common/intrange.hh>
 #endif
 
 #include <dumux/common/properties.hh>