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The class Alpha_status<NT> is a small data strructure to store
the critical alpha values of faces of an alpha shape.
Each face has three critical alpha values, called
alpha_min, alpha_mid and alpha_max in increasing order.
The face will be exterior for any 
< alpha_min,
singular for alpha_min 
< alpha_mid,
regular for alpha_mid < alpha_max
and interior for alpha_max alpha.
The value alpha_min is undefined for faces which are not Gabriel
faces and therefore do not appear in the alpha complex
without any of their
including face. The value alpha_max is undefined
for convex hull faces which can never be interior,
The data structure also includes two boolean to mark
if the face is a Gabriel face or a convex hull face.
The class Alpha_status<NT> is paremetrized by a number type NT.
#include <CGAL/Alpha_shape_cell_base_3.h>
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default constructor.
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