New packages: ucminfcpp & optimizr

Package 'ucminfcpp' provides an Rcpp integration for 'ucminf' that is part of this task view since long. I suggest to add a reference to this package in the same entry as 'ucminf', thus not opening another entry.
I have tested 'ucminfcpp' with the 'Historize' procedure, it returns absolutely identical intermediate and end results as 'ucminf' and is faster, as expected.

• Package ucminf implements an algorithm of quasi-Newton type for nonlinear
  unconstrained optimization, combining a trust region with line search approaches.
  The interface of ucminf() is designed for easy interchange with optim().
  Package 'ucminfcpp' reimplements the UCMINF algorithm as C++ code using Rcpp. [QN]

Package 'optimizr' provides a reimplementation of the 'SANN' option of R Base' 'optim' function. 'SANN' is kind of deprecated anyway. I am not in favor of adding 'optimizr' to the task view, but probably there is no choice.

Open the Optimization task view and locate the existing ucminf entry. Review where ucminfcpp should be referenced alongside it, and check the request concerning optimizr. Done means the task view accurately reflects the package references, subject to the maintainers' decision about optimizr.