[mod_sndfile] add stereo to mono support for file formats that need it (eg: gsm, vox), add unit test for stereo
[mod_sndfile] mono to stereo and stereo to mono unit tests.
[unit-tests] mod_sndfile: don't wait for recording file to be flushed to disk by the core, use switch_ivr_stop_record_session()
[mod_sndfile] fix format "wve" (Psion Series 3)
[mod_sndfile] fix format "htk" (Hidden Markov Model Tool Kit)
[mod_sndfile] fix file format "iff" (AIFF)
[mod_sndfile] fix file format "xi" (FastTracker 2)
[mod_sndfile] fix file format "sds" (Midi Sample Dump Standard)
[uni-tests] add more audio file extensions to sndfile unit tests.
[mod_sndfile] add config file support (with one param currently: "allowed-extensions")
[mod_sndfile] add sample file sndfile.conf.xml to 'testing' and 'vanilla' cfg trees.
[mod_sndfile] free() cfg xml
[unit-tests] mod_sndfile: unload module test.
[unit-tests] mod_sndfile: add conf file unit-test (param that allows only certain file extensions)
[unit-tests] adjusts Makefile.am for new CI (tests)
[unit-tests] adjust path to sound file.
[unit-tests] [mod_sndfile] remove Makefile.am from test/
[unit-tests] [mod_sndfile] fix build (Andrey)
