Log Message:
Update math/R-chron to 2.3-47.

2015-06-24  Kurt Hornik  <Kurt.Hornik@wu.ac.at>

 * DESCRIPTION (Version): New version is 2.3-47.
 * NAMESPACE: Add missing imports.

2015-02-11  Kurt Hornik  <Kurt.Hornik@wu.ac.at>

* DESCRIPTION (Version): New version is 2.3-46.

 * R/times.R:
 * man/trunc.times.Rd:
 Add round method for times objects via Math.times (to
 be able to use the same arguments as the trunc methods,
 differently from the generic).
 Suggestion by Gabor Grothendieck <ggrothendieck@gmail.com>.