・Corrected a minor notational error in the first "respectively," of Proposition 5.7,  (ii), (b) ・Slightly modified the discussion of parallel line segments, parallelograms, frames,  and orientations in Proposition 2.5, (b), (c), (d); Remark 2.5.1; Proposition 2.6,  (a); Corollary 2.7, (e) ・Corrected a slight error concerning the discussion of the group "A(k_H)" in Remark  1.5.4, (i)