[Namespaces changes]

vert->vrt


clean up of some namespaces to comply the following naming:

Complexes (3 letters namespaces):
order 0 (point cloud    ) :vrt
order 1 (edge meshes)     :edg
order 2 (triangle meshes) :tri
order 3 (triangle meshes) :tet

Simplexes (extended namespaces):
order 0 (vertex)      :vertex 
order 1 (edge)        :edge 
order 2 (triangle)    :triangle (temporarily it remains "face")
order 3 (tetrahedron) :tetrahedron

vcg/complex/vertexmesh/allocate.h

@@ -32,7 +32,7 @@ $Log: not supported by cvs2svn $
 #define __VCGLIB_VERTEXALLOCATOR
 
 namespace vcg {
-namespace vertex {
+namespace vrt {
 /** \addtogroup vertexmesh */
 /*@{*/
 /// Class to safely add vertexes and faces to a mesh updating all the involved pointers.