Summary message wrong

@jneundor reported here that he observed the following and inconsistent printouts

ERROR in TQHistoMakerAnalysisJob::bookHistogram(...) : Missing valid histogram title
[...]
INFO: Number of alert messages printed:
INFO: No messages of type warning or worse printed

The reason is that the summary message only summarizes the messages that were sent by TQLibrary's instance of TQMessageStream. TQHistoMakerAnalysisJob, however, uses its own instance to write error messages. I'm wondering if there is a reason that this class uses its own instance. If it could be changed to use TQLibrary's instance, then our summary message would work fine.

Since this is a piece of code that hasn't been touched in 6 years, I'm tagging @cburgard and @rgugel.