Lock before deleting files

As reported in FS#69614 the lock should be before the delete for when another sync job is running rsync can't move the files as they are removed. https://bugs.archlinux.org/task/69614

added 12 commits

• 9438ed3d...f32f3995 - 11 commits from branch master
• 73bf287a - Lock before deleting files

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merged

mentioned in commit dde2bb8a