in-place processing

[luka]

> Could machine developers give feedback on this? What kind of
machines
> would not work with running in place? Should we have a
machine-type
> attribute that basically says "don't optimize me to run in
place" for
> those machines, and just assume it's allowed for other machine
types? This
> would be trivial to add.

i think it's somewhat safer to assume its not allowed and make it
possible to allow it. 
probably its a good idea to support this optimization, most other
(dsp) plugin apis have
something similar. 

LF