Simulation: if -1 for number of events, simulate until EOF and end gracefully calling TerminateRun

[andresailer]

BEGINRELEASENOTES

• DDG4: add possibility to simulate all events in a file by passing NumberOfEvents < 0. Fixes DDG4: Add option to run over all events in input file #237
  • The de-facto limit is ~2 billion, which should be fine for input files.

ENDRELEASENOTES