log to stderr

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2404 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/base/src/log.cc

@@ -81,7 +81,7 @@ void Logger::PopVerbosityLevel()
 std::ostream& Logger::operator()(enum LogLevel l)
 {
   if(l<=level_) {
-    return std::cout;
+    return std::cerr;
   }
   return null_;
 }