Options.cxx: Change shortflag to -L for log file.

algo/base/Options.cxx

@@ -54,7 +54,7 @@ Options::Options(int argc, char** argv)
       "set log level (debug, info, warning, error, fatal)")
     ("monitor,m", po::value(&fMonitorUri)->value_name("<uri>")->implicit_value("file:cout"),
       "URI specifying monitor output (e.g. file:/tmp/monitor.txt, influx1:login:8086:cbmreco_status). Prints to cout when no argument is given. Monitor is disabled when flag is not set.")
-    ("log-file,f", po::value(&fLogFile)->value_name("<file>"),
+    ("log-file,L", po::value(&fLogFile)->value_name("<file>"),
       "write log messages to file")
     ("num-ts,n", po::value<int>(&fNumTimeslices)->default_value(-1)->value_name("<num>"),
       "Stop after <num> timeslices (-1 = all)")