Implement the fix that is already present in assignment operator (in particular
for dynare#1782).

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

Automatically detected by clang-tidy with performance-move-const-arg check.

Do not make the modification for Tokenizer::location type, since we have no
guarantee that the type will remain trivially-copyable in the future.

Also add some annotations to remove some false positives.

There remain some boost-related false positives, it’s unclear how to suppress
them.

Initialization with initalizer list is nicer. And, more importantly,
initialization with parentheses is not supported by Clang < 16.

This allows the compiler to better optimize by inlining those call when worth
it.

The C99 copysign() function was used in the generated C output, but that
function does not correctly handle zero. Replace it by a custom sign()
function.

Use map::{try,}emplace() instead of operator[], which should in theory be
slightly faster.

The function is now provided separately by Dynare.jl.

– DataTree::packageDir() now takes a std::string_view, returns a
  std::filesystem::path, and no longer creates that directory
– DataTree::writeToFileIfModified() now takes a std::filesystem::path as
  argument
– Do not call DataTree::writeToFileIfModified() for generating MATLAB/Octave
  files, since it does not work (the directory inside which the file is written
  has been deleted by the preprocessor just before)
– Consistently use DataTree::packageDir() everywhere (for compatibility with
  planner_objective)

By the way:
– improve the semantics by having a consistent treatment of empty substring
  components (previously, only the last one was ignored)
– move it to DataTree to make it more accessible from elsewhere (even though
  ideally it should be in a “utilities” namespace).

– factorize common code between the static and the dynamic version
– reorganise language-specific code into dedicated functions
– use a function template in the main helper to do some computations
  at compile-time (using constexpr features)

As a consequence, add many [[maybe_unused]] attributes for legitimate
cases (mainly in virtual functions).

By the way, remove other unnecessary calls to that constructor.

– a generic one: CommonEnums.hh
– and a bytecode-specific one: Bytecode.hh

By the way, rename global constant “near_zero” into “power_deriv_near_zero”,
for clarity.

Ref. Madysson/estimation-codes#5

Closes: #85

This option tells the preprocessor not to use the commutativity of addition and
multiplication when looking for common subexpressions.

As a consequence, when using this option, equations in various outputs (LaTeX,
JSON…) will appear as the user entered them.

There is however a potential performance cost to using this option, yet to be
determined.

Ref. dynare#1788

If the old file and the new contents shared a common prefix, then the output in
the generated file would be truncated at the start.

Ref. DynareJulia/Dynare.jl#1

Ref. DynareJulia/Dynare.jl#1

DataTree::operator=(): fix crash when symbol ID ordering of model local variables does not correspond to the recursive ordering in the model block

Ref. dynare#1782

Many recursive function on ExprNodes were not correctly recursing into the
definition of model local variables.