Explicitly close sockets to make tests run faster.

default.

Guillaume's request.

the tests.

'show' command.

same results regardless of case.

(1) Change the mapping from zLOG levels to logging levels to use
    custom intermediary levels 15 and 5 for BLATHER and TRACE, rather
    than using a confusing skewed mapping.

(2) In the ZConfig datatype definition for a logging level, added
    'blather' and 'trace' to the level names, added 'warning' as an
    alias for 'warn', change 'all' to mean 1, and add 'notset' to mean
    0.  The semantics of NOTSET are very different than those of 1;
    setting a logger's level to NOTSET searches for a parent logger
    with a nonzero level.  The root of all loggers is initialized with
    WARN as its level, so setting the level to NOTSET effectively sets
    it to WARN rather than to the most inclusive level!

(3) In the schema, change the default level for handlers to notset, so
    they use their logger's level; the default level for the logger is
    set to info, corresponding to the old default for
    STUPID_LOG_SEVERITY.

properly, including that use of the these stream names uses a delayed
lookup of the streams).

configuration files easier to read.

is piping it to a program that reads logging message from stdin.

exist (no guarantees though, oh well).

it is already absolute; there may be a good reason.

Add an <eventlog> section to the runner schema.
Some comment and docstring tweakage.

types.

Add socket-name to runner conf template.
Check that the port isn't in use already.

acts more like what happens when you commit new object revisions using
the higher level interface.

- make it easier for an admin to configure logging levels
  (by making the defaults more sane)
- refactor the tests a little, in preparation for more tests

- remove methods that aren't needed
- rename "resolved" to "instance" for readability

- de-tabify everything

_deadline to None, to prevent reporting the same timeout more than
once.  Added a helpful comment too. :-)