Documentation for `options` parameter to `datatable()` etc. points at DataTables' documentation for v2.x (the only docs they have available), but DT is still using 1.13

This led me to believe I could use some of the newer features, that actually don't work (specifically, setting an initial `order` via column names).

This is mostly DataTables' fault, for not providing legacy documentation for v1.13 after they released v2.0, but the R docs for DT could at least warn about this issue.