Deleted include/CGAL/ch_value_type.h.
- Removed inclusion of and deleted file gnu_istream_iterator_value_type_fix.h.
- Removed the use of include/CGAL/ch_utils.h from all files and removed it.
- Removed the dependancy of include/CGAL/Kernel/Traits_aids.h.
- Added ch_melkman.h. So far, only ch_melkman.C existed and was used for
inclusion.
- Moved include/CGAL/ch_timing_2.[hC] to examples/Convex_hull_2/include/CGAL
only.
- Reformatting and cleanup of include/CGAL/ files.