Cleanup TmpDir

Cleanup of TmpDir was *temporarily* commented out to be able to debug the "Unicode strange chars issue". In the meantime /mnt/tmp got really huge (currently 186k entries), which is not good (we don't want to hit a hard limit on files/dir). **Let's put back the cleanup and only comment it out again, if needed.**

Plus delete stuff older than 7 days (?):
`find /mnt/tmp -mtime +7 -delete`