writetimeout wasn't taking effect if
idletimeout wasn't also set. Also, timeout check would keep getting
pushed back if multiple writers were waiting.

are no-user-mod.

Binds are performed using the frontend, to allow them to trigger the
updateref on a consumer, which can then be forwarded by the chain overlay.
Setting is ignored if server is not a consumer.

Remove '#if 0 / broken code / #endif.  Rearrange pool_wrapper() to avoid
decrement-increment(ltp_active_count) when more tasks available.