With stem naming, `IMG_0001.xmp` is the sidecar of every file of that stem and, in a
folder Lightroom has worked on, it is the raw's. On import the packet was looked up
with the library naming alone, so a TIFF or JPEG arriving beside a raw of the same
name read the raw's packet and took its rating, label, keywords and `crs:` develop
settings (the case radialmonster reported in #92; the read side of a catalogued photo
is #1523).
`ImportStems` ranks the files an import is adding as if they were catalogued already,
in the order `StemOwners` uses for writing: the library's files and the arriving ones
together, a raw first, then the file name in lower case. A file that does not own the
stem sidecar reads only its own `<file>.xmp`, never the sibling's packet. A file that
is not catalogued yet has no id, and the id it draws when the import commits is above
every id in the library, so it loses a tie against a catalogued file; between
arriving files the order they arrive in stands for it.
Folder synchronize and the Lightroom catalog import go through the same function, so
a file arriving there is ranked the same way.
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