cpacejo/aeolus

Aeolus is a synthesised (i.e. not sampled) pipe organ emulator that should be good enough to make an organist enjoy playing it. Merge of <http://kokkinizita.linuxaudio.org/linuxaudio/aeolus/index.html>, <https://github.com/SimulPiscator/aeolus>, and my own changes.