+ follow-up of "prober: first find all old files, only then remove"
+ if prober didn't have time to delete all files during last cycle, prober would keep a stored m_iter, which would be incorrect
+ don't store m_iter, reset it every time
+ removed support for BOOST_FILESYSTEM older than 3 (2 was needed for squeeze only)
+ fixed early stopping - time should be checked both when looking for files and when deleting them
+ fixed methods, which instead of using their argument, were using m_iter for some mysterious reason