added ChangeLog and NEWS entries for KK's PR on R_xlen_t

these are obviously somewhat abbreviated and could be expanded

Author: eddelbuettel

ChangeLog

@@ -9,6 +9,16 @@
         `character.only=TRUE` from `requireNamespace()` as it happens to flip
         the boolean value too
 
+2015-06-03  Qiang Kou <[email protected]>
+
+        * inst/include/Rcpp/*: Finish changing R_len_t to R_xlen_t
+        * src/*: Ditto
+
+2015-05-16  Qiang Kou <[email protected]>
+
+        * inst/include/Rcpp/*: Begin changing R_len_t to R_xlen_t
+        * src/*: Ditto
+
 2015-05-17  Matt P. Dziubinski  <[email protected]>
 
         * inst/include/Rcpp/platform/compiler.h: Added RCPP_USING_CXX0X_OR_LATER

inst/NEWS.Rd

@@ -6,6 +6,9 @@
   \itemize{
     \item Changes in Rcpp API:
     \itemize{
+      \item All internal length variables have been changed from \code{R_len_t}
+      to \code{R_xlen_t} to support vectors longer than 2^31-1 elements (via a
+      pull request by Qiang Kou)
       \item The sugar function \code{sapply} now supports lambda functions
     }
     \item Changes in Rcpp Attributes: