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Does not work for Julia mode, neither with block and bytecode.

Note: in DLL mode, the number of temporary terms in no longer given in the
‘ntt’ symbol; it must be computed using ‘M_.dynamic_tmp_nbr’.

Ref dynare#217

Use ReplaceShorterLiterals option to enforce replacement of all strings.

https://clang.llvm.org/extra/clang-tidy/checks/modernize-raw-string-literal.html

Here, emplace() and insert() are not interchangeable because this is a std::set of
std::vector<int>, and we really want the initializer-list constructor of
std::vector (and not the two int's constructor).

Fixes the test deterministic_simulations/lola_solve_one_boundary.mod

when an equation is of the form `X` = `constant`, replace all occurrences of `X` in other equations with `constant`

To install this version of gcc:

~$ brew install gcc@7

Does not seem to work with gcc-8 (missing headers…).

Those const data members are simply made public.

Also, no longer compute two times symmetric elements in derivation w.r.t.
parameters at order 2, for consistency with derivation w.r.t. endogenous.
It is therefore now necessary to duplicate them in the output to keep behavior
unchanged.

Closes #13

This is the first step towards computing k-order derivatives.

Ref dynare#217, #10

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.

Since, in this case, there are less equations than endogenous, the
variable_reordered structure was not filled with enough element, leading to an
invalid memory read when printing M_.state_var.

Ref #637

In particular, it is necessary to turn back DataTree::AddVariable() into a
non-virtual method, because it is called from DataTree's constructor. Enforcing
the absence of leads/lags is now done using a new boolean DataTree::is_static.

Take advantage of the new copy constructor for handling
PlannerObjectiveStatement more elegantly.

Unfortunately it is not possible to implement *move* constructor / assigment
operators, because the reference ExprNode::datatree is not mutable.

Commit c6cb9aa1 was not the right fix.

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

This mimicks the structure of M-functions (though the logic for filling the
temporary terms vector is a bit different).

This change implied a modification in the way we compute the checksum in case
of block decomposition (the temporary terms for the C output are not correctly
computed in that case).

Adds a new model option "linear_decomposition" that creates a block composed of the non-linear equations o the model

Since model local variables are now treated as temporary terms, they must be
marked as such even when option notmpterms is present.

Incidentally, replace the IS_* macros by inline functions.

- M and MEX files are now under +${MODELNAME}/
- bytecode and C source now under ${MODELNAME}/model/