Introduce a simple treenode class for working with trees
Introduce a simple treenode class for working with trees

Domain classes will inherit this tree node class to work with the
concurrency control provided by ccf.

Signed-off-by: Aki Saarinen <2c8035bb80cf98a391872dcbe797b269d759f6d9@reaktor.fi>

akisaarinen/ccf,akisaarinen/ccf