'Convert::yEnc' decodes yEncoded files and writes them to disk. File parts
are saved to _$tmpDir_; when all parts of a file have been received, the
completed file is moved to _$outDir_.
'Convert::yEnc' maintains a database of partially received files, called
the RC database. The RC database is loaded from disk when a 'Convert::yEnc'
object is created, and saved to disk when the object is 'DESTROY''d.
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