merge dev_5_0 -D org -I include -E exclude: PR 890 (CZI: make sure that SubBlocks are correctly initialized in openBytes)
merge dev_5_0 -D org -I include -E exclude: PR 894 (Make a buildable source release (5.0))
merge dev_5_0 -D org -I include -E exclude: PR 895 (Logback 2 (incl. docs))