
avoid spurrious failures (for example because of the various possible
type names for STL containers) and to report details on the nature of
the mismatch: explicit list missing base classese, missing data members
or the actual differences in type or comments.
For example:

<pre>Warning in <TStreamerInfo::CompareContent>: The following data member of the on-file layout version 2 of class 'Tdata' differs from the in-memory layout version 2:
   double mydouble; //
vs
   double mydouble_two; //
Warning in <TStr