Add support for cronolog type logging file separation. For example:

TransferLog "|/usr/sbin/cronolog /web/logs/%Y/%m/%d/access.log"
ErrorLog "|/usr/sbin/cronolog /web/logs/%Y/%m/%d/errors.log"

This allows each log file to be separated by year, month, etc.

See http://cronolog.org/features.html for details.

Interestingly enough, TimeBasedRollingPolicy already supports this feature. It's just not tested nor documented.