core implementation of new style chunking

Not yet used by any special remotes, but should not be too hard to add it
to most of them.

storeChunks is the hairy bit! It's loosely based on
Remote.Directory.storeLegacyChunked. The object is read in using a lazy
bytestring, which is streamed though, creating chunks as needed, without
ever buffering more than 1 chunk in memory.

Getting the progress meter update to work right was also fun, since
progress meter values are absolute. Finessed by constructing an offset
meter.

This commit was sponsored by Richard Collins.

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