NEWS
* 041110
  - 041110 OpenAL++ now uses its own ref_ptr, this means that the responsibility of
    deleting Sources Samples etc. have been resolved. 
  - A new example osgalmultiple example demonstrates this.
  - A few method have changed semantics:

     //The last argument now specifies if getSample()/getStream() should add any found and loaded samples/streams
     //to the cache for faster access later on.
     SoundManager::getSample(const std::string& path, bool add_to_cache=true );
     SoundManager::getStream(const std::string& path, bool add_to_cache=true );

     SoundManager::clearSampleCache()
     SoundManager::clearStreamCache()

     now takes care of cleaning the caches.

  - SoundManager::clean() is deprecated and replaced by the method shutdown().
    shutdown must be called prior to end of main() function. Otherwise OpenAL will cause
    problems during deallocation of sources later on.


* 040621 Fixed bug in SoundRoot. Now uses correct modelview matrix.
