first pass at publishable NEWS

Author: MichaelChirico

NEWS.md

@@ -42,7 +42,9 @@
 
 8. `groupingsets()` gets a new argument `enclos` for use together with the `jj` argument in functions wrapping `groupingsets()`, including the existing wrappers `rollup()` and `cube()`. When forwarding a `j`-expression as `groupingsets(jj = substitute(j))`, make sure to pass `enclos = parent.frame()` as well, so that the `j`-expression will be evaluated in the right context. This makes it possible for `j` to refer to variables outside the `data.table`.
 
-9. (add example here?) New functions `cbindlist` and `mergelist` have been implemented and exported. Works like `cbind`/`merge` but takes `list` of data.tables on input. `merge` happens in `Reduce` fashion. Supports `how` (_left_, _inner_, _full_, _right_, _semi_, _anti_, _cross_) joins and `mult` argument, closes [#599](https://github.com/Rdatatable/data.table/issues/599) and [#2576](https://github.com/Rdatatable/data.table/issues/2576).
+9. New `cbindlist()` and `setcbindlist()` for concatenating a `list` of data.tables column-wise, evocative of the analogous `do.call(rbind, l)` <-> `rbindlist(l)`, [#2576](https://github.com/Rdatatable/data.table/issues/2576). `setcbindlist()` does so without making any copies. Thanks @MichaelChirico for the FR, @jangorecki for the PR, and @MichaelChirico for extensive reviews and fine-tuning.
+
+10. New `mergelist()` similarly works _a la_ `Reduce()` to recursively merge a `list` of data.tables, [#599](https://github.com/Rdatatable/data.table/issues/599). Different join modes (_left_, _inner_, _full_, _right_, _semi_, _anti_, and _cross_) are supported through the `how` argument; duplicate handling goes through the `mult` argument. Thanks Patrick Nicholson for the FR (in 2013!), @jangorecki for the PR, and @MichaelChirico for extensive reviews and fine-tuning.
 
 ### BUG FIXES