sets the maximum file size
for subsequent dir actions. multilog will decide that current is big enough
if current has size bytes.
will also decide that current is big enough
if it sees a newline within 2000 bytes of the maximum file size;
it tries to finish log files at line boundaries.) size must be between 4096 and 16777215.
The default maximum file size is 99999.
sets the number of log files
for subsequent dir actions.
After renaming current,
if multilog sees num or more old log files,
it removes the old log file with the smallest timestamp. num must be at least 2.
The default number of log files is 10.