[CollEc] path stats

icanis@helos:~$ get_path_stats count: 42308 age: 0.00159722222222222 119.728631991389 232.322094907407 done: 168 age shows min, average and maximum age. Done shows the number of files done since the last RAS data update. At CZ's suggestion, I have added nice to new invocations of path calculations. -- Written by Thomas Krichel http://openlib.org/home/krichel on his 21768th day.