Related papers: Phases and phase transitions in two dimensional su…

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This paper has been withdrawn by the authors due to several major changes in concepts and results. New version will follow briefly as a new e-print.

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This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

This paper has been withdrawn by the author, since now all four parts of the review are available as a single file 0804.1639. I also made some revision of the text in order to avoid misprints and some inaccurate expressions.

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