Decide on whether to drop Dynare++

Most functionality of Dynare++ has been integrated to Dynare. We are moving closer/further with tickets like #1802 (closed) But there still are some parts that Dynare++ is capable of that are not supported in Dynare. From what I can see we have

1. approximation around something like the stochastic steady state (--steps option for steps in the volatility direction). Related Dynare ticket:
2. numerical accuracy checks.

I would propose to drop Dynare++ once we have these features in place in Dynare. For

1. we have the related risky steady state (#1338 (closed)), the nonlinear moving average codes (!653 (closed)). I am also pretty sure there are newer developments.
2. we have the ticket #147