(std test) and (std stm) were pages next to folders of their submodules, and
the std menu lists folders first, so each showed up twice, far apart. The
module page is now the folder's index.sz, so the menu has one entry for it,
and its submodules are listed at the top of the page and in the menu below.
(std test prop), (std test gen) and (std test expect) get pages, and the
standard library chapter says what they have and links to them.
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Part II's section on concurrency has a new subsection, "Shared state:
atomics and transactions": when to share data instead of sending it,
locations and atomically, the rules for a transaction function, waiting
with tx-retry, a transaction as an event in a choose, tx-or-else, the
queue, map and counter, and what transactions cost. The examples use
the card game and were compiled and run.
Part III has a section on std/stm that links the four reference pages:
(std stm), and (std stm queue), (std stm map) and (std stm counter) in
a directory of their own, as (text xml) has.
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