Added comments to DOALL

Author: hpcdgrie

src/OpenCOVER/cover/coVRPluginList.cpp

@@ -40,7 +40,8 @@ using namespace covise;
 
 typedef opencover::coVRPlugin *(coVRPluginInitFunc)();
 
-// do something for all plugins
+// do something with "plugin" for all initialized plugins
+// as soon as one plugin loads or removes a plugin the iteration stops
 #define DOALL(something) \
     { \
         m_stopIteration = false; \