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— On GNU/Linux, the locally installed binary now has priority over the
  system-wide binary
— Do not require 32-bit binary if we are on a 64-bit system and the 64-bit
  binary is there (or vice versa)
— Code factorization in the detection logic

On Windows and macOS, those binaries are now bundled in packages. On Debian,
one can use the official x13as package.

Provide alternative implementations, taken from Dynare.

Provide alternative implementations, taken from Dynare.

for dseries (see 48115cb8, which does not work with Octave) or a
method (see ef923e41, which does not work with all supported Matlab's
versions) to initialize the dseries class.

To initialize the toolbox:

 - Add the `src` folder in the path
 - run `dseries().initialize()`

This is an Octave compatibily workaround, Octrave cannot handle
simultaneously +folder (namespace) and @folder (class).

As a consequence, no need to download the binary on the CI runners, since it is
already there.

Unless explicitely requested.

Should fix build error in travis-ci.

... Also do not crash dynare_config() if matlab is not able to download the X13 binary.

Created instead a new function dseries2struct, which can be called as:

>> o = dseries(randn(10,2));
>> s = o.struct();

Also

 + Added a routine to create a dseries object from a structure (if all
 required field are available).

 + Added the possibility to instantiate a dseries object from a structure.

Use X13 Census for estimation.

Necessary if dseries class is not used with Dynare.

When NaNs are present in the dataset. Do not return an array filled with
NaNs if only the first observations are NaNs.

 + Code factorization.
 + Allows regular expressions in subsasgn method.