New estimation

Write the new estimation interface in the preprocessor. A description of what is needed is given on the wiki (http://www.dynare.org/DynareWiki/NewEstimation).

In commits: 29bead75 through 87ffab32

Matlab code and documentation in the reference manual still need to be added.

marked this issue as related to #824

marked this issue as related to #846

marked this issue as related to #642

marked this issue as related to #1593 (closed)

changed the description

added decision label

changed milestone to %6.x

marked this issue as related to #568 (closed)

At 2022 summer school, @stepan-a told that he would implement it during August 2022.

removed decision label

mentioned in issue #1857

removed time estimate

changed milestone to %7.x