fixup couple of naming issues

dune/stuff/common/misc.hh

@@ -45,7 +45,7 @@ namespace Common {
 template <class StlSequence>
 inline int getIdx(const StlSequence& ct, const typename StlSequence::value_type& val)
 {
-  auto result = std::find(ct.begin(), ct.end(), val);
+  const auto result = std::find(ct.begin(), ct.end(), val);
   if (result == ct.end())
     return -1;
   return std::distance(ct.begin(), result);

dune/stuff/common/parameter/validation.hh

@@ -186,6 +186,7 @@ private:
 
 INVERSE_VALIDATE(ValidateNone, ValidateAny);
 INVERSE_VALIDATE(ValidateGreaterOrEqual, ValidateLess);
+INVERSE_VALIDATE(ValidateNotLess, ValidateLess);
 
 //! validate arg iff arg \in [min,max]
 template <class T>