by namespace CGAL { and } //namespace CGAL. in all .h and .cpp files
in a directory.
Apply it to all packages in the trunk
Remove macro definition from the config.h file.
This adds requirements to TriangulationTraits2 concept :
Less_x_2 and Less_y_2 predicates.
Also fixes a few bugs in RT2 (hidden points were sometimes forgotten
in degenerate dimensions.)