Homology and topological full groups of étale groupoids on totally disconnected spaces

This paper was published in error and is a duplicate of pdr029, which was originally published in Volume 104 Part 1 of the Proceedings of the London Mathematical Society . The originally published version of this paper can be found here: 10.w1112/plms/pdr029, Proc. London Math. Soc. (2012) pdr029 first published online August 10, 2011 doi:10.1112/plms/pdr029 . The publisher hereby retracts this duplicate version and discourages citations of it.