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Fixed dependency on m-unit-tests toolbox.

Takes into account the change for the dseries initialization routine.

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).

Using the old HTTP URL makes test fail.

For a zero, it returns -Inf.
For a negative number, it returns NaN.

This is not exactly the same behavior as MATLAB's log function, because we want
to enforce type stability (i.e. never return a complex).

'A', 'Q', '1900Q', 'Q1', 'M', '1900M', 'M1','W', '1900W' and 'W1'
should not be interpreted as dates.

All dseries syntaxes now work under Octave, except ts{'variable'}(range) = value.

On MATLAB, importdata() is better at automatically guessing the delimiter.
Enforce tab delimiter to make it work on Octave.

Closes #39

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

It is possible to rename the dseries class. For instance, the
following is a valid syntax:

>> tseries = dseries();
>> tseries(ones(3,2))

ans is a dseries object:

   | Variable_1 | Variable_2
1Y | 1          | 1
2Y | 1          | 1
3Y | 1          | 1

It is also allowed to define a default starting period for the data passed
to the renamed dseries class/object:

>> tseries = dseries('1938M11')
>> tseries(ones(83,2))

ans is a dseries object:

        | Variable_1 | Variable_2
1938M11 | 1          | 1
1938M12 | 1          | 1
1939M1  | 1          | 1
1939M2  | 1          | 1
1939M3  | 1          | 1
1939M4  | 1          | 1
1939M5  | 1          | 1
1939M6  | 1          | 1
1939M7  | 1          | 1
1939M8  | 1          | 1
        |            |
1944M11 | 1          | 1
1944M12 | 1          | 1
1945M1  | 1          | 1
1945M2  | 1          | 1
1945M3  | 1          | 1
1945M4  | 1          | 1
1945M5  | 1          | 1
1945M6  | 1          | 1
1945M7  | 1          | 1
1945M8  | 1          | 1
1945M9  | 1          | 1

... a datafile which does not exist.