Log Message:
Update nas to version 1.9.1.

This version adds some enhancements to aupanel, and reworks signal
handling in the voxware server to avoid races, hangs and other issues
seen with linux 2.6.21+ kernels. Other changes relating to the default
value of the 'MixerInit' option and the new location of the local unix
socket on Linux systems were also made.

Also include a patch from Aleksey Cheusov for a
"libpthread: Unlocking unlocked mutex" bug.