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This paper has been withdrawn by the authors due to substantial changes.

This paper has been withdrawn since its content is included in the more general version arXiv:0804.1882

This paper has been withdrawn by the authors, due to the requirement of the Journal where a modified version will be published.

This paper has been withdrawn by the authors. Our basic argument on the gauge invariance presented in this paper cannot withstand the criticism which has been drawn to our attention by several colleagues.

This paper has been withdrawn by the author(s) in the light of several other works available and due to a misunderstanding in the authorships.

This paper has been withdrawn by the author due to an error.

%auto-ignore This paper has been withdrawn by the author, due to a crucial error.

This paper has been withdrawn.

This paper has been withdrawn. See quant-ph/9806031 for a discussion.

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This paper has been withdrawn by the author(s)!

This paper has been withdrawn by the author due to a crucial sign error in Theorem 3.4.

This paper has been withdrawn for the reasons mentioned in the Comments.

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2073.

This paper has been withdrawn by the author, due a critical mistake on page 3.