For complete putenv()-like behaviour.

Further investigation on why putenv() caused EFAULTs on execve() and
segfaults on reload:

putenv(3):

   "The string pointed to by string becomes part of the environment,
    so altering the string changes the environment."

setenv(3):

   "This function makes copies of the strings pointed to by name and value
    (by contrast with putenv(3))."
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

Use of putenv() to set LADSPA_PATH broke the proccess environment variables, for some
unknown reason, causing segfaults on "reload mod_ladspa" and restarting
FreeSWITCH (with "fcstl shutdown restart").
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

although quite a few things have changed in the test suite

while. The only big changes are a majorly rewritten V.42 and V.42bis which are
now basically functional.

ftdm_copy_string() length parameter needs to include the terminating NUL byte.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
Tested-by: Stefan Knoblich <stkn@openisdn.net>

add --enable-timerfd-wrapper to wrap timefd syscalls for platforms with the right kernel and wrong libc

Libpri doesn't do that for us, so handle things on our end.
Other parts of the previous patch seem to work fine.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

add execute_on_fax_success, execute_on_fax_failure and execute_on_fax_result channel variables to trigger an app or lua script when a fax result is received

auto populate global origination_caller_id_name/number from effective_caller_id_name/number in enterprise originate

Adds a new "overlapdial" configuration parameter that enables
incoming overlap dialing when set to "incoming", "yes" or "both" (possible values:
"no", "yes"/"both", "incoming"/"receive", "outgoing"/"send").

(Overlap dialing is disabled by default)

NOTE: only the non-overlap receive case has been tested (= doesn't break existing setups)
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

See FS-3379

ftmod_sangoma_isdn.c:ftdm_sangoma_isdn_io_run()
	remove unused variable wflags.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

ftdm_io.c:ftdm_channel_process_media()
	status variable was set but otherwise unused
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>