Adding some unique information in the log seems to be crucial.

Just realized the urge of unique meaningful id in the each of the log files. It looks messy without it now, I'm kind of lost among couple of dozens of run logs.

Decide to add run time stamp along with name of config used:

## current setup: running at Friday, April 13, 2007, 10:11:40 AM HST,
config used: config_O3_2000.xml