Use PulseAudo output instead of ALSA, if PulseAudio is available

[RussianNeuroMancer]

Binary package hint: smplayer

Bacuse all major distributions now have PulseAudio by default (even Kubuntu will have PulseAudio after Maverick release) it's will be nice, and also solve few mplayer<->alsa bugs, if SMPlayer detect installed PulseAudio and use it's by default.
Here is example of bug what present if we use ALSA output, and not reproducible if we use PulseAudio output: https://bugs.launchpad.net/mplayer/+bug/611809

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: smplayer 0.6.9-1
ProcVersionSignature: Ubuntu 2.6.35-19.28-generic 2.6.35.3
Uname: Linux 2.6.35-19-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Thu Sep 9 02:33:56 2010
ProcEnviron:
 LANGUAGE=ru_RU
 LANG=ru_RU.utf8
 SHELL=/bin/bash
SourcePackage: smplayer

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.