Fixes:
    cc1: warnings being treated as errors
    src/switch_core_session.c: In function 'switch_core_session_thread_pool_worker':
    src/switch_core_session.c:1478: warning: format '%ld' expects type 'long int', but argument 9 has type 'switch_size_t'
    src/switch_core_session.c:1483: warning: format '%ld' expects type 'long int', but argument 9 has type 'switch_size_t'
    gmake[2]: *** [libfreeswitch_la-switch_core_session.lo] Error 1
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Hunt for a free channel for incoming calls that do not
preselect a channel (pevent->ring.channel == -1).

Verify the preselected channel for calls that do specify a channel
and in case the channel is already taken, hunt for a free one,
or abort with an error message (if the preselection was exclusive).

TE-mode channel selection is the same as before
(there's still room for improvement, though, but i'll save that for later).

The MSN/DDI filter code is moved into the TE-mode section (only useful there).

The duplicate ring detection had to be reworked. We now store the
call reference (CRV) in caller_data->call_reference of the selected channel
and do a CRV -> channel look up with find_channel_by_cref()
at the top of on_ring().

NOTE: This is only lightly tested (NT/TE mode), i'd either have to
      write a lot of custom code to check it toroughly or the need for
      a scriptable ISDN stack...
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Same as ftmod_isdn, '#' key ends overlap receive and moves the incoming
call to RING state.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

FS-4079 FS-4540 regression from 5213c764 please update ASAP if you are running this one

Changed mod_spandsp so it tries to resolve timezone names like Asia/HongKong
to a POSIX timezone descriptor string, like other parts of FreeSwitch do.

Its them damn gremlins.

                   seems to be causing confusion and annoying users

OS X apparently doesn't support \W.

Thanks-to: Peter Olsson <peter.olsson@visionutveckling.se>

FS-4528 --resolve

Tell people where to go to get the repository for building the
freeswitch-sounds-* and freeswitch-music-* Debian packages, as well as
what to read when they get there.

After chasing down a few memory leaks that two of which were in the freeradius library, the result is more standardized memory cleanup.