[R-pkgs] new version of survey package

[Thomas Lumley]

Version 2.9 of survey is on CRAN.  In addition to various minor 
improvements and bug fixes there are two major changes

- full multistage finite-population sampling is supported (as in SUDAAN)
- the same analysis commands can be used for all design types (eg svymean
   instead of svrepmean for replicate weight designs)

 	-thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle