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This paper was withdrawn by the author because severe errors were discovered.

This paper has been withdrawn, since it contains a corollary with impossible consequences and the source of an error is currently unknown.

This paper has been withdrawn by the author because it was a speculative investigation.

This paper has been withdrawn by the author.

This paper has been withdrawn because of serious errors.

This paper has been withdrawn by the author, since now all four parts of the review are available as a single file 0804.1639.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.

This paper has been withdrawn by the author(s), due a crucial error in Eqn. 30.

This paper has been withdrawn.

This paper has been withdrawn by the author due to an error in the computation of the central charge.

This paper has been withdrawn

This paper has been withdrawn by the author due to a crucial error in the definition of homomorphism.

This paper has been withdrawn by the author due to time-consuming revision.

This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the authors, because the authors have second thought that the new ideas in this paper are better to be contained in another paper.

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn.

This paper has been withdrawn by the author due to a crucial mistakes.

This paper has been withdrawn, and will be superseded by another submission.

This paper has been withdrawn by the author.