Fix ri and pool (2.17.1)
mice 2.17
delete .R files to replace by .r in next commit
Reintroduce .r files
Correct stripplot problem. 2.17 as on CRAN.
merge in upstream changes for 2.17

Only conflict was in DESCRIPTION because I reordered them.
It changes .R->.r for all files, and new date and version.
comment the use of "global" variables