revert change from 2800ea19 and add disconnect packet on listener kill

use switch_queue_trypop_timeout instead of a timer in mod_loopback to improve audio quality when not using bowout features

use aleg arg to disable this

not sure the stuff is needed in the core iksemel. this will take some more teting via hudson and some more comits, but hey, it does not have an impact on anythingbut solaris and derivates

don't hold loadable_modules.mutex while a module shutdown function is run, so that we do not prevent new channels from being created.

fix unreachable condition with a null args to make any key stop playback/record etc without dequing and remove hard-coded flush digits in play_and_get_digits be sure to flush it yourself before using

FS-3000 mod_conference: if more digits than the length of the correct pin the remaining digits are accounted for next retry

"LIBS" in the final fsxs script will be empty now.
We still link against libfreeswitch when building a module,
but we don't explicitly list (some of) its dependency libs anymore
(this list was not complete anyway).

This fixes a bogus /path_to_source/expat.la entry in LIBS that
came from "apu-config --libs".

Tested on Gentoo x86_64 (binutils 2.20.1) and Centos 5.5 (binutils 2.17.50).
Tested-by: Stefan Knoblich <s.knoblich@axsentis.de>
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

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