Integrated branch manifold_id_intermediated into trunk.

git-svn-id: https://svn.dealii.org/trunk@33158 0785d39b-7218-0410-832d-ea1e28bc413d

diff --cc deal.II/doc/news/changes.h
index 5b1d5b9809aaa254b29c263742713c63f23800d2,5b1d5b9809aaa254b29c263742713c63f23800d2..335ef8d0ff867e7f6a4a0ca65c2def4b480ac18d
--- 1/deal.II/doc/news/changes.h
--- 2/deal.II/doc/news/changes.h
+++ b/deal.II/doc/news/changes.h
@@@ -139,6 -139,6 +139,29 @@@ inconvenience this causes
    <br>
    (Wolfgang Bangerth, 2013/12/21)
    </li>
++
++  <li> New: Added support for curved interior boundaries, and general
++  manifold id description.
++  <br>
++  A new flag was added to each triangulation obejct
++  (types::manifold_id) which allows one to specify a manifold
++  description, much in the same way we do for boundaries, also for
++  interior edges and faces. At the moment this information is used
++  only for objects of topological dimension less than spacedim, but a
++  generalization of the class Boundary<dim,spacedim> is on its way to 
++  allow also curved cells.
++  <br>
++  For the moment, full backward compatibility is granted, and one can 
++  keep using the old Boundary<dim,spacedim>, together with 
++  Triangulation::set_boundary(), and Triangulation::get_boundary() 
++  methods. However, this change suggests to use the types::boundary_id associated
++  with each boundary face to indicate only boundary condition types, and 
++  it allows to separate the geometrical meaning from the physical meaning. The 
++  suggested usage is types::boundary_id -> physical meaning, types::manifold_id
++  -> geometrical meaning. 
++  <br>
++  (Luca Heltai, 2014/07/14)
++  </li>
  </ol>