Ref. dynare#1929

They would be ignored.

See:
- https://github.com/Homebrew/homebrew-core/issues/165388
- https://trac.macports.org/ticket/69639

By the way, fix the error message if a compiler cannot be found.

Enable the option `dr_cycle_reduction_maxiter` to be parsed

See merge request !104

See issue #1920

…instead of cerr.

— Bounds can now be arbitrary expressions of parameters (and not simply
  constants as previously);
— It is now possible to specify both a lower and an upper bound in the same
  condition.

So for example one can now write something like:

 lhs = rhs ⟂ 1+alpha < y < 2+beta;

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).

Bug introduced in 0eb11d33.

Ref. !103

The symbol can be either input:
– as ⟂ in UTF-8 (codepoint U+27C2)
– or as _|_ in ASCII

The old syntax using the “mcp” tag is now obsolete, but kept for backward
compatibility.

Closes: #127

By the way, also improve the terminology used in variable and method names: a
“constraint” is something like “ZLB” or “INEG”, a regime is a state in which
constraints are either binding or relaxed.

Really closes: #103

Ref. dynare#1918

In particular, emit more explicit error messages in the presence of
inconsistencies.

Closes: #103

Closes: #124