Integrate the TaRB-algorithm into Dynare

Update unit tests to use correct steady state files

Filter out case where estimated_params block is present but smoother on calibration is requested

Fix bugs in dyn_mex.m under Windows

Fix bug for models with leads and legs in exo variables

Port bugfix #920 for Bayesian IRFs to BVAR routine

Fixes plotting of IRFs where IRFs turn from negative to positive

This reverts commit 28ffa9c5, reversing
changes made to 60b3577a.

Conflicts:
	preprocessor/Shocks.cc
	preprocessor/SymbolTable.cc

This reverts commit def2bf81.

This reverts commit 8bc946c1.

In this case, xparam1 will be empty while estim_params_ does not have conformable dimensions.

Also moves additional optimizer-related files to corresponding subfolder
Closes #894

(commit lost in merge)
(cherry picked from commit d7db5070e7cf8d1b043062b04d3bd3c4e18ce6c1)

Add check for unique data entries in dataset

Leads to cryptic crashes if not filtered out

Various fixes to GSA and Identification