Changes

Checking tree node by model should not automatically check its children
In a tree with property autoCheckChildNodes checking a node 
automatically checks all its children. When then a child node is 
unchecked and the site is reloaded the unchecked node gets checked again 
because its parent node is checked.
When synchronizing the values from the model to the tree only the nodes 
that are checked in the model should get checked in the tree.
242678
Change-Id: Ic41524d8e4b02ba605d21f9f971a97daa1e3e7a8 Signed-off-by:
Roger Stebler <Roger.Stebler@bsi-software.com> Reviewed-on:
https://git.eclipse.org/r/138542 Tested-by: CI Bot Reviewed-by: Claudio
Guglielmo <claudio.guglielmo@bsiag.com>