Add changelog entries.

diff --git a/doc/news/changes/incompatibilities/20170812LucaHeltaiDavidWells b/doc/news/changes/incompatibilities/20170812LucaHeltaiDavidWells
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+Changed: Triangulation::get_manifold() will now return a FlatManifold instead of
+a StraightBoundary in the case that no manifold description has been attached to
+a provided manifold ID.
+<br> (Luca Heltai, David Wells, 2017/08/12)

diff --git a/doc/news/changes/incompatibilities/20170812LucaHeltaiDavidWells.2 b/doc/news/changes/incompatibilities/20170812LucaHeltaiDavidWells.2
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+Changed: The member function Boundary::project_to_surface is now ignored in the
+function GridTools::fix_up_distorted_child_cells. Instead,
+GridTools::fix_up_distorted_child_cells uses an internal function that
+duplicates the algorithm used by StraightBoundary::project_to_surface, which was
+the only place project_to_surface was implemented in the library.
+<br>
+(Luca Heltai, David Wells, 2017/08/12)