some small fixed, and test coverage

.../detail/modules/writers/ObservationPlaneWriterParquet.inl

corsika/detail/modules/writers/TrackWriterParquet.inl

corsika/detail/output/BaseOutput.inl

corsika/detail/output/DummyOutputManager.inl

corsika/detail/output/OutputManager.inl

corsika/detail/output/ParquetStreamer.inl

corsika/output/BaseOutput.hpp

corsika/output/ParquetStreamer.hpp

tests/CMakeLists.txt

tests/modules/testObservationPlane.cpp

tests/output/CMakeLists.txt

tests/output/TestMain.cpp

tests/output/testDummyOutputManager.cpp

tests/output/testOutputManager.cpp

tests/output/testParquetStreamer.cpp

tests/output/testParquetStreamercpp