Add three conversion operators for iterators of different type. For example, it is now perfectly legal to write   Triangulation<dim>::cell_iterator cell = dof_handler.begin(); Previously, this was not possible, since the DoFHandler returned an object of type   TriaIterator<dim,DoFCellAccessor> while the left hand side required a   TriaIterator<dim,TriaCellAccessor> Since the first accessor is convertible into the second, it is now possible to convert the first data type into the second.
Add three conversion operators for iterators of different type. For example, it is now perfectly legal to write
  Triangulation<dim>::cell_iterator cell = dof_handler.begin();
Previously, this was not possible, since the DoFHandler returned an object of type
  TriaIterator<dim,DoFCellAccessor>
while the left hand side required a
  TriaIterator<dim,TriaCellAccessor>
Since the first accessor is convertible into the second, it is now
possible to convert the first data type into the second.


git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@856 0785d39b-7218-0410-832d-ea1e28bc413d

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