lei q: mbox*: disable changing parallelism, add --rsyncable

Unfortunately, being mairix-compatible with --threads means we
can't change thread-count of gzip, bzip2, or xz when writing to
compressed mbox with a --threads= parameter.  It's probably not
worth changing, anyways, so another switch or additional value
for --jobs= won't be added.

While we're in the area, add --rsyncable support since
most installations of gzip support it nowadays.

Fixes: 5beb4a5f6585acd ("lei: replace --thread with --threads")

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