Define basic streaming interface
Refine the streaming interface
Implement a ToTree sink
Implement bitstream decoder
Merge branch 'devel' into stream-concept
Merge branch 'devel' into stream-concept

Conflicts:
	CMakeLists.txt
Implement and test tree and bitstreams
Refactor test utils into separate header
Fix wrong test
Make record tests use compliant structstream blobs
Migrate record tests to streams
Add utility to mark the end of a stream in a sink
Send end-of-stream event from FromFile
Implement ToTree stream sink
Implement FromTree stream source
Convert tests to test against streams
Remove obsolete r/w classes
Add missing license header
Delete invalid references to obsoleted files
Some helper functions for streaming