Bugfix in convolver

When leaving the loop early, the iterator "input" failed to be
incremented.

Thanks to Micha Horn for discovering this bug!
Convolver: check for all zeros in prepare_partition()
Fix old bug in simpleprocessor
Remove has_begin_and_end from simpleprocessor
APF examples: add automatic connections ...

... to jack_dynamic_inputs/jack_dynamic_outputs.
jack_dynamic_outputs: use POSIX instead of dummy thread policy
Don't sleep when redirecting "--version"

Closes #13
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