big mumbo jumo of interleaved patches.

big mumbo jumo of interleaved patches.
* Use seperate "state" and "config" paths
* Pass the fact that we are in system mode via an env var $PULSE_SYSTEM instead of as var in pa_core
* Properly check proc name when checking PID files. Don't check exename, because we cannot read that for other uids

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@2480 fefdeb5f-60dc-0310-8127-8f9354f1896f