pothos-blocks: work on de/serializer blocks
pothos-blocks: test util blocks random test plans
pothos-blocks: use the test plan to simplify unit tests
pothos-library: added header file documentation
pothos-blocks: serializer unit test with test plan
pothos-blocks: misc tweaks to serializer
pothos-blocks: feeder source orders labels, also sends all at once
Merge branch 'serializer_work'