version bump
add facility to de/activate tree base memory optimizations
fix remove of user. As email is in that case a part of credential it must be set to NULL before delete.
fix use of uninitialized value
use silent build again
Merge branch 'next' into release0.1.5
revert version to 0.1.5 after fixes from next have been merged...I have to obey my workflows to prevent such things in future.