Ref. #1689

In particular, merge back preprocessor information.

Those had been incorrectly converted to GPL-3+ in commit
1bf81c9f.

Note that, for get_mean, the syntax with an optional order is not documented,
because the semantics is different at order 2, and it does not work for higher
orders.

Closes: #1687

[skip ci]

Closes issue #1679

[skip ci]

Closes: #1650

This is necessary for Octave under Windows, to avoid a warning about isdir()
triggered by user_has_octave_forge_package.m.

Ref. preprocessor#40

Also add a regression test.

Closes: preprocessor#40

The old option is left for backward-compatibility purposes, but it has the same
effect as the new one.

Closes: #1093

Ref. !1692

[skip ci]

- macro processor: fix bug where command line arguments that began with an integer were being treated as integers even if they weren't (e.g. dates)
- macro processor: allow colon-separated arrays as command-line defines
- use prefix notation `R"()"` for quote in quotes

The failure is impossible to reproduce outside the runners. Skip the test, for
lack of a better solution.

Rather mention Windows 8.1.

MATLAB crashes, most likely due to an internal bug.

— fix LaTeX compilation error with some expressions (#263)
— fix handling of some special characters in LaTeX
— add “xls_sheet” and “xls_range” to “calib_smoother” (#1695)
— license file update

In this version, fminunc fails due to Inf value.

For earlier versions, either use bsxfun or handle special cases differently.

Document xls_range/sheet options of calib_smoother

Closes #1695

See merge request Dynare/dynare!1696

Closes Dynare/dynare#1695

`check` has two OPTIONS

[skip ci]

Particle filters: provide error if trends or prefiltering is used

Closes #1690

See merge request Dynare/dynare!1695

Closes Dynare/dynare#1690

Because at some point throwing exceptions from MEX files (with mexErrMsgTxt())
was not working under Windows 64-bit, we had designed a workaround to avoid
using exceptions.

Most MEX files were returning an error code as their first (or sometimes last)
argument, and that code would have to be checked from the MATLAB code.

Since this workaround is no longer needed, this commit removes it. As a
consequence, the interface of many MEX files is modified.

For some background, see https://www.dynare.org/pipermail/dev/2010-September/000895.html