・Updated the Acknowledgements ・Made a slight modification concerning the use of the term  "torsion-cyclotomic" in Definition 3.1, (i) ・Corrected a slight misprint concerning injectivity in  Definition 3.1, (ii) ・Added a missing "the" in Remark 3.2.2 ・Corrected a slight misprint at the beginning of the second  sentence of Proposition 3.2 ・Corrected a slight misprint "[Ih]]" in the Bibliography ・Replaced the phrase "finite extension" by "subfield" in the  discussion following the first display of Definition 5.1, (ii) ・Corrected two misprints involving "\Pi" in Definition 4.1, (ii) ・Corrected two misprints at the end of Definition 4.1, (iv) ・Corrected a minor misprint in the displayed statement in Remark  1.11.4, (i) ・Corrected a minor misprint in the discussion immediately following  the display of Remark 1.5.3, (i) ・Corrected a minor misprint at the end of Proposition 1.6, (ii) ・Replaced three instances of "X" by "U" in Proposition 1.8, (i), (ii)