(do_set_presentation): Call it.  Clean up variable names, and
	remember the text statuses of the old and new presentation so
	they can be passed to send_async_new_presentation().  Include
	the text number of the old presentation in the error message
	that is printed if the old presentation lacks a mark.

(client_extracting_expect): New proc.

(isc_insert): Changed return type to void.

	useless nlinks field.
(isc_remove): Don't manipulate the useless nlinks field.
(isc_create): Ditto.
(isc_destroy): Ditto.

	adnshost is built, and the other stuff in noinst_DATA was also
	not needed until check time.

improvements.

lyskomd_start to modifiy the compiled-in default of "Sync interval".

	interfere with the tests.  Added a colon to the strings that
	base_config is checked against, so that parameters that are
	prefixes of other parameters are handled correctly.

(update_history): Adjusted.
(update_one_stat): Adjusted.
(check_one_stat): Adjusted.

Don't use a file descriptor that interferes with the test suite.
Don't log simple reverse lookup errors for localhost, since they
interfere with the test suite and are fairly common and harmless.

	due to "nxdomain" or "inconsistent".

	to PROTECTED_FDS in unix.exp.
(site.exp): Set lyskomd_host to whatever 127.0.0.1 resolves to,
	or 127.0.0.1 if it cannot be looked up at all.  Set
	valgrind_fd to the constant defined in VALGRIND_FD.
(valgrind.wrap): Use VALGRIND_FD, instead of hardcoding the value
	in two places.  Changed the valgrind file descriptor to 21,
	which is currently the highest reserved file descriptor.

	that valgrind_fd is set properly.
(lyskomd_host): This is now set in site.exp, not here.
(l2g_start): Use valgrind_fd instead of hardcoding the value.
(spawn_lyskomd): Ditto.
(dbck_run): Ditto.

since we enabled ADNS.  Attempt to fix.  But can they really have an
extra overhead of 8-9 file descriptors?

lookup hasn't completed yet.  Don't crash if shut down with a pending
reverse DNS lookup.