30177
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10718 More commands for Node Navigation
https://pharo.fogbugz.com/f/cases/10718
10411 flush after nextChunkPut:
https://pharo.fogbugz.com/f/cases/10411
Diff information: http://smalltalkhub.com/mc/Pharo/Pharo30/main/NodeNavigation-MarcusDenker.38.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Collections-Streams-MarcusDenker.135.diff
