(devel/R-waldo) Updated 0.3.1 to 0.4.0

# waldo 0.4.0

* Atomic S3 classes with format methods now use those methods when
  displaying comparisons (#98). If the printed representation is the
  same, they fallback to displaying the underlying data.

* Rowwise data frame comparisons are now much much faster (#116),
  and respect the `max_diffs` argument (@krlmlr, #110).

* Unnamed environments now compare by value, not by reference (i.e. if
  two environments contain the same values, they compare the same, even
  if they're different environments) (#127). Environments that contain
  self-references are handled correctly (#117). Differences between pairs
  of environments are only ever reported once.

* In the unlikely event that you have bare CHARSXP objects, waldo now
  handles them (#121).

* S4 objects are labelled with their class, not all superclasses (#125).

* `compare_proxy()` ignores the `"index"` attribute for data tables
  (@krlmlr, #107), and works again for `RProtoBuf`  objects
  (@MichaelChirico, #119)

* Infinite values can be compared with a tolerance (@dmurdoch, #122).

(mef)