dahdi-tools: Removed dahdi_tool, as it requires libnewt (it's not optional unfortunately). Also add fxotune.

Signed-off-by: Vittorio Gambaletta <openwrt@vittgam.net>
Merge pull request #5 from VittGam/master

dahdi-tools: Removed dahdi_tool, as it requires libnewt (it's not optional unfortunately). Also add fxotune.