Add search script for OpenAL.
Add CMakeLists.txt for avango-openal.
Remove duplicated code.

DRY.
Use schism math types.
Add alut and vorbisfile.
Use openal example from attic.
Remove obsolete SConscript.
Add Readme.txt.
Adapt to avango changes.
Merge branch 'feature/openal' into develop
Fix path in Readme.txt.