Visualization scripts for DDP.
Command-line arguments, time scale fix.

(not tested due to not very good connectivity tight now, will test)

Add of command line arguments to the visualization script, now you can run it with directory as argument:

    python logs2plot.py /home/user/logs

Also fixed probable time scale error. Times in eventlog in nanoseconds, script used 1e6 as a divisor to get them to seconds. Now time scale is 1e9 and is common in all time scale operations.