Tag UGens: Dfsm - m_count should be float

integers cannot be NaNs, required for demand-rate polling

Signed-off-by: Tim Blechmann <tim@klingt.org>
MCLDUGens: NearestN - avoid deadlock

GET_BUF locks the buffer, so we have to make sure that it runs out of scope
before calculating the first sample

Signed-off-by: Tim Blechmann <tim@klingt.org>
NearestN: check buffer dimensions in _next not ctor (in case changed on-the-fly)
update list in readme