Bugfixes and log cleanup in EventFilter/Utilities

Hi,
this pull requests fixes these issues:

* process termination via SIGINT/SIGTERM. Previously some threads did not catch this and process would be left hanging. Event counting consistency check (exception thrown) is turned off for signal interruption.
* added file size to the output json for cross-checks in the output data merging stages
* removal / rate reduction of log messages from EvF components and more uniform formatting (for the new log output parser in EvF)
* removing changes in json library that were introduced for debugging, but I forgot to remove them.