Updated NEWS corresponding to changes in commit #1206 (1.9.3).

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/datatable@1208 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Test id now printed in dev mode using \r, so we don't have to comment/uncomment

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/datatable@1209 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Bug fixes for #5296 and #5321.

+ Fix for #5296. `[.data.table` now retains the same class as the input data.table.
+ Fix for #5321 - handling POSIXlt columns during data.table creation.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/datatable@1210 edb9625f-4e0d-4859-8d74-9fd3b1da38cb