Readout filter process may not join

Readout filter process returns but does not join if data_buffer is filled (fill_buffer=True). This causes a deadlock and breaks e.g. the global threshold tuning.

changed milestone to %Release 1.0

added Bug label

changed weight to 10

mentioned in merge request !306 (merged)

assigned to @mfrohne

Multi processing/threads is difficult to get right. I would therefore not do that.

closed via merge request !306 (merged)

mentioned in commit 589f928c