The document used for a stage request can be accepted also for other requests asking for a list of files

A document describing a stage request includes an array "files" of file objects, each including a "path" string. Such a document could also be accepted for other requests simply accepting an array "paths" of strings. For these requests (archiveinfo, cancel, release), first check if "paths" exist, then fallback on "files".

See issue #13 (closed)