XXX This will probably hang for Guido.

Mark each WorkerThread as a daemon.  Attempt to join() it when the
test exits, but do so with a timeout.  If, after the join(), the
thread is still alive, mark the test as failed.  Since it's just a
daemon thread, the test program should still exit.

Also, reformat doc strings, remove an unused global variable, and
remove one whitespace character.  (I've already used the whitespace
in a different module.)

No log writer that I know of has a reinitialize() function.
zLOG has an initialize() function, but it isn't easy to get at yet.

Add a couple of simple tests that make sure that start.py script
runs.  The tests are meager -- most of the possible arguments are
untested -- and only run on Unix.

I think this is the log call that has been killing backends by sending
very large strings.

It's not a good idea to set this option.

Log message less choppy.

There was an info-level log call when a transaction was blocked, but
not a complementary one when the transaction was resumed.  Added the
latter, so that the log provides a clear record of whether the server
is wedged or working.

I was always uncomfortable with this, but its portability is a simple
justification for removing it.

        standard output unless the "EVENT_LOG_FILE" or "STUPID_LOG_FILE"
        environment variable is set.

      - The much-hated name "STUPID_LOG_FILE" now has a preferred
        alias:  "EVENT_LOG_FILE".

turn on TCP_NODELAY, in both directions. This avoids latency when a request or response doesnt fit in one packet. ZEO is already doing its best to buffer data before calling send, so TCP_NODELAY can do little harm

may not believe the bucket is an object" pain.  Simplified the exit maze.

rearranged so that damaged info isn't left behind in case of a
persistence error; added another assert for "the other way" an empty
BTree may get created.

fine; just keeping the test suite as closely in synch as possible.

is empty.

use it, but this is really a step on the way to speeding "lopsided
merges".

macros from Zope3.  These allow converting some runtime tests into
compile-time specialization, and that's going to be more important for
work on speeding "lopsided merges".

weightedIntersection.

intersection and union functions:  get the concept of weight entirely out
of the internal set iteration protocol.  The caller wants values, or
doesn't, and that's just a Boolean.  This makes for some nice little
internal simplifications, but doesn't yet change any semantics.

leaving negative weights alone for now.