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MATLAB R2009b is not able to handle HTTPS requests.

Also, having the data in the git makes the testsuite robust to network failures.

Using the old HTTP URL makes test fail.

Packages are no longer autoloaded, so testing whether they are "Loaded" does
not work in all cases.

The function now ensures that the package is loaded.

This change was made for consistency with commit 7cbac0c9 in Dynare.

(cherry picked from commit 280a9346)

(cherry picked from commit 31a4fef3)

With octave the names of the variables on the first line were not
read. With Matlab the first variable name was missing if dates were not
provided in the first column.

(cherry picked from commit 1684e944)

Try to determine the values of these dummy variables from the content of
the first line and the first column

Also, for people who don't have the IO package, always use the fallback
code (even when the first line is <= 4096 bytes long).

Ref #2