Log Message:
(devel/R-checkmate) Updated 2.0.0 to 2.1.0

# Version 2.1.0
* New arguments `n.chars` and `max.chars` for `checkCharacter()` and
  `checkString()`.
* Checks for integerish now compare the tolerance with the difference to the
  nearest integer with `>` instead of `>=` to allow specifying a tolerance of
  exactly `0` (#177).
* Checks for integerish now check for class `Date` an `POSIXt`.
* Coercion of double to integer in `assertInt()` and `assertIntegerish()` now
  round to the nearest integer instead of always rounding via `trunc()`.
* Fixed an error message where the wrong variable name was reported by
  `assert()` (#182).
* Checks on POSIXct dates with storage mode integer should now work instead of
  raising an exception (#175).
* `*Matrix()` and `*Array()` now allow different storage types than the one
  specified if all values are missing (#184).
* Function `assert()` now supports collecting assertions via `AssertCollection`
  (#112).
* New exported C function `qcheck()` (#180).
* Fixed a bug in `checkFunction(..., ordered = TRUE)` (#204).
* Removed deprecated S macro `DOUBLE_EPS` from C source.