0.15.21

• Bugfix: creating a file copy on a storage pool dir could fail - Fixes #324
• Bugfix: when creating a parent folder (eg. missing share folder in storage pool), we need to use the proper 'original folder' to copy the ownership + permission from. - Fixes #319
• Bugfix: don't show a warning about logrotate not being installed, when in fact it's man that isn't installed - Fixes #313
• Fixed build_vfs.sh for Samba 4.15 on Fedore; less verbose build_vfs.sh output - Fixes #316
• Balance task is now better at finding the right files to move first, for faster results