PICARD-3012: Sort files by disc no. when submitting cluster as release #2572
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This ensures the disc numbers are in order even if the cluster gets edited after clustering.
Summary
Problem
When submitting a cluster as release the files inside the cluster are expected to be ordered by discnumber. Directly after clustering this is the case, but if files get added to the cluster later or if the discnumber tags on clustered files get edited, this is no longer true.
Since the consecutive indexing of submitted mediums relies on disc number changing to create a new disc this breaks.
Solution
Sort the files by discnumber when gathering the submission data.