[Libguestfs] [PATCH libnbd 0/5] copy: Allow human sizes for --queue-size, etc

See companion patch: Subject: [PATCH nbdkit] server: Move size parsing code (nbdkit_parse_size) to common/include This is the second part of the patch. It adds the new human_size_parse function to libnbd and then uses it for parsing --queue-size, --request-size and --sparse. The main complication here is that there was already a common/utils/human-size.h header which ends up (eventually) being combined with the new header, but the process to get there and ensure that git bisection works is lengthy. Eventually we can copy the new, combined "human-size.h" back to nbdkit, but I didn't add that yet. Rich.