Minarca client suspends operations when log file reaches 5 MB - no log rotation

Only tested on the Windows client so far (I have so far only used backupninja on my Linux clients).

When doing backups consisting of a large number of files, the log file (minarca.log) quickly reaches 5 megabytes, and the backup stops. After truncating the log file, the job is easily resumed, however. I am admittedly not very experienced with the Python logging module, but it seems as though there is a time-based log rotation configured (rotate once per day, keep 5 copies?). However, in practice, it seems like there is also a size based rule in effect (perhaps some default/implicit thing?), without an implementation of the actual rotation. Please forgive my clumsy wording.

As a workaround, I currently have a small PowerShell script running on the side which truncates the log regularly, to keep the backup job from stopping.