[coreutils] [PATCH] coreutils new feature: split --filter

[Karl Heuer]

For some years now I've been bemoaning the lack of a
`split --filter=COMMAND' feature, which would write to
pipes instead of files, instead of having to split to
a set of files and then run the filter on each of them.
The environment variable FILE is set to the name of the
file that would have been written; it's the command's
responsibility to use that string appropriately.
Sample usage (note proper quoting of $FILE):
$ split --filter 'gzip >$FILE.gz'

The details turned out to be rather trickier than I'd
expected, but I think it's ready to be shared with the
folks in charge of coreutils.  Source patch attached.
I haven't touched the documentation or tests.

split.patch
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