Build: simple_describe_multiset() is only used in PIKE_DEBUG.
pgsql: Do not bother to close unnamed statements.
pgsql: Show filedescriptor in %O.
pgsql: Set preparedname earlier to eliminate a race with fast servers.
pgsql: Discard data on portals that have already been closed.
pgsql: Improve debugging output.
pgsql: Eliminate parsing race for very fast servers.
pgsql: Merge shortlived mutexes to improve cache-locality.
pgsql: Remove cruft and decouple one shortmux.
pgsql: Recouple mutexes for optimum performance.
pgsql: Move direct multiset to a permanent pmod.