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This paper has been withdrawn. A significantly revised version will be posted in the near future.

The paper has been temporarily withdrawn.

This paper has been withdrawn by the author since the comments have been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the authors, due to the discovery of paper 0201028 which predates it and contains most of it's results.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author

This paper has been withdrawn.

This paper has been withdrawn by the authors and replaced by the revised version in arXiv:0709.1772.

This paper has been withdrawn by the author. A revised and expanded version is gr-qc/9907028 (Phys.Rev. D60 (1999) 104043).

This paper has been withdrawn. It was an early draft submitted prematurely in error. A complete version is to be submitted shortly.

This paper has been withdrawn by the author

This paper has been withdrawn by the authors, since it has been merged with Part I (ID 0802.3570)

This paper has been withdrawn by the author due to the need for further revision.

The paper has been withdrawn

This paper has been withdrawn by the authors. The authors have now written two separate papers, one theoretical (A. Smerzi, A. Trombettoni, P. G. Kevrekidis, and A. R. Bishop Phys. Rev. Lett. 89, 170402 (2002)) and one experimental (F. S.…

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the author.