Fix bug in Bayesian estimation where the filter_step_ahead command produced no output

- Improves documentation of resulting matrices
- Adds unit test for filter_step_ahead option

(cherry picked from commit cd3b5bf3d98984514dda6945ada63e11568139cd)
Do not replicate fsdat_simul.m (use the one in tests/fs2000 folder).

(cherry picked from commit 534b54074f47a86300f3a22da26f2259e2eae15d)
Added mod files (and associated steadystate files) for k_filter_ahead in the testsuite.

(cherry picked from commit 1fe12d9c3ef9c26c5c7ac6901f06c64ff5e76967)
Various minor fixes to the ref. manual

(cherry picked from commit 1caa3ff171a0289a382905b1e540b715e3079116)
Release notes for 4.4.0 release

(cherry picked from commit 0bcc3eb48f435a88c1e25c66128ae9064f1c9a95)
Fix MATLAB version number

(cherry picked from commit 57fb62e138aab3bec49dcab6aca694c4b0a4ea02)
ms-sbvar: corrected bug in initialization/computation of final subperiod

(cherry picked from commit ed15f0bcac24a9c0bdf7c59dea6f152c7b306cd1)
ms-sbvar: corrected bug in initialization/computation of final
subperiod

(cherry picked from commit 1ddd00b502007e2640fcb48e64fc651f42abb46e)
Add missing antislashes
(cherry picked from commit 857a2b0e3538fb8e0bf520876943e04b117f7ca3)
fix permissions

(cherry picked from commit 7cc259ea467744ab20875fe106c3a816efb9dd8a)
reporting: for windows filenames escape underscore

(cherry picked from commit 85905cbb1d8c43e80b677de2dfffeea7d28761f7)
reporting: fix figure inclusion for windows

(cherry picked from commit 99f4a01a48bf9bd834f82c9fad18f70f6869e302)
reporting: fix typo

(cherry picked from commit 3990707e364652a1dabe7a7c88a8bacf3b803e50)
ms-sbvar: corrected bug with final_subperiod default value and
clarified in the manual.

(cherry picked from commit 77fdd3bfda7dac6a7aafab824f4915efaa1de52f)
ramsey_policy: correcting the computation of the value of the
objective function; adding details about the period objective function
in the manual.

(cherry picked from commit 58c40fdca99c5b371f6d26125b7fc8ef817df6d2)
Adding correction of evaluation of planner objective to NEWS file
Fix internal link for verbatim section
(cherry picked from commit 684ce13ac1293afb8bdffb52be33d296090d07cc)
Fixes to the release notes
(cherry picked from commit c6ca0c593c7cf8d10799b2f90d180df9222b0000)
Bug fixes (related to the loading of the mcmc files) + Cosmetic changes.

(cherry picked from commit 832f8ee82f8f49830655afebeca052e3f86797be)