– New “heterogeneity_dimension” statement
– New option “heterogeneity” to “var”, “varexo”, “parameters”, “model” and
  “shocks” statements
– New “SUM()” operator in “model” block

The vector of lower and upper bounds is now provided by
{static,dynamic}_complementarity_conditions.m (which accepts parameters as an
argument, in preparation for the possibility of having parameters in
complementarity conditions).

The index that denotes the reordering of equation residuals (so that the
residual of an equation appears at the index of the endogenous appearing in the
complementarity condition) is now in “M_.{static,dynamic}_mcp_equations_reordering”.

Constraints declared through the ramsey_constraints block are also incorporated
in this new interface (and therefore “M_.ramsey_model_constraints” has been
removed).

In particular, makes clearer the distinction between configuration and
configuration file. The former includes information that is not in the
latter (command-line options.)

Automatically detected using clang-tidy with bugprone-reserved-identifier
check.

By the way, homogeneize the define identifiers in relation to camel case
convention.

Previously, the MinGW location was appended multiple times to the PATH
variable, which in some cases would make the variable too long and thus
dysfunctional.

The variable is now initialized once when the worker threads are created.

By the way, move the macOS+Octave environment variable initializations to the
same place, for consistency.

[skip ci]

This simplifes the treatment of the new sparse representation, which creates
several subdirectories in the “+” package folder.

When computing the derivatives or block decomposition of the planner objective,
the epilogue or the original Ramsey model, the preprocessor would talk about
dynamic/static model, which was confusing. It now uses the right terminology.

Creates a VarExpectationModelTable analogous to PacModelTable.

Otherwise clang emits this warning:
 using directive refers to implicitly-defined namespace 'std'

Incidentally, the auxiliary endogenous variable representing Z₁ and created for
PAC MCE models no longer necessarily appear as the first auxiliary variable (so
this is effectively a revert of 64f55e4a).

Consequently drop “occbin” option to “model”.

Incidentally, allow more values in equation tag names (previously some keywords
such as “alpha” were disallowed).

Ref. #68

For the time being, the preprocessor will refuse that this option be used with
any command other than estimation.

By the way, remove occbin_likelihood and occbin_smoother options to estimation.

Ref. dynare#569

Also remove the det_cond_forecast interface, that was related to it.

Ref. dynare!1626
Closes: #39

— output Julia files as soon as “language=julia” is passed, independently of
  the value of the “output” option
— drop the “dynamic” and “first” values of the “output” option, since they
  actually do nothing
— obey the “output” option even in the deterministic case

Ref. dynare#1600

Ref. dynare#1743

Ref. Enteprise/dynare#4

Do not print the total computing time at the end of the driver.

Allows for the inclusion/exclusion of a set of equations, specified either on the command line or in a text file.

If the equation has a single endogenous variable on the LHS, then the equation is moved. If not, if the equation has an `endogenous` tag then that variable is removed along with this equation. If not, then an error is thrown.

As a command line argument, `exclude_eqs` can take the form (same syntax for `include_eqs`):
* `exclude_eqs=eq1 to remove all equations declared as `[name=eq1]`
* `exclude_eqs=[eq 1, eq 2]` to remove all equations declared as `[name=eq 1]` or `[name=eq 2]`
* `exclude_eqs=[tagname=X]` to remove all equations declared as `[tagname=X]`
* `exclude_eqs=[tagname=(X, Y)]` to remove all equations declared as `[tagname=X]` or `[tagname=Y]`

When declared in a file, the file should be of the form:
```
eq 1
eq 2
```
to remove all equations declared as `[name=eq 1]` or `[name=eq 2]`.

It should be of the form:
```
tagname=
X
Y
```
to remove all equations declared as `[tagname=X]` or `[tagname=Y]`.

This is made possible by the getLagEquivalenceClass() method introduced in the
previous commit.

Previously, the static version of the LHS expressions was used.

As a consequence, drop ModFile::diff_static_model, now useless.

Bug introduced in 0c755460, that manifested on the Gitlab runners.

Note that there is no equivalent of boost::filesystem::unique_path(), so I
implemented ModFile::unique_path() which does something similar.

Simply redirect cout to /dev/null, instead of propagating a boolean
everywhere.

New options "mexext" and "matlabroot" are introduced, so that the preprocessor
knows where to find MATLAB and which architecture to compile for.

Only recent gcc is now supported. A set of optimization flags is used so that
compilation goes reasonably fast on large models.

Consequently, options "msvc", "mingw" and "cygwin" have been removed.

The syntax makes clearer the distinction between a function call and an
initialization. Also, it prevents bugs due to implicit type conversions.

For a rationale, see http://www.sjbrown.co.uk/2004/05/01/always-use-explicit/

Closes: Dynare/dynare#1315