RANN 2.2.1
==========
* fix yet more warnings for CRAN due to presence in ANN of 
  exit(), std:cout and std:cerr

RANN 2.2.0
==========
* no user-visible changes in theory
* switch to roxygen2 for documentation
* use this to provide a NAMESPACE as requested for CRAN
* and switch from deprecated .First.lib to useDynLib