gsmopen: AT+CREG erratic behavior does no more give errors or warnings when badly formatted unsolicited signaling

This lets you specify a FS_SOUNDS_DIR in which to look for the sound
tarballs.  This makes it easier to use git clean -fdx without
downloading the sounds every time.

Previously if --enable-core-odbc-support was set but unixodbc-dev was
not available, we would fail during make rather during configure.

Fix lintian reported issue with version number ending with 0. As per: Debian Developer's Reference section 5.11.2

Fix a bash variable default assignment issue when variable is missing. Also remove unneeded verbosity from the tar extraction.

Fix debsrcbuilder.sh script, and add option in src_tarball script to allow for alternate tmp directory location.

Resolve a missing build-dep. Resolve a handful of lintian warnings and errors. Cleanup in prep for 1.2 release packaging. --resolve FS-3449

FS-4135 --resolve hint, add a leading '=' to disable passing a-leg codecs <param name="outbound-codec-prefs" value="=6839{outbound_codec_prefs}"/>