Add 'parentproject' operator that includes changes of child projects

With the 'parentproject' operator one can find all changes of a
project and its child projects. This is e.g. useful to watch a project
tree.

Change-Id: Id45e6fc391137a1830a1782fea0b1326c661afa9
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
7 files changed