(cherry picked from commit bde57b55)

(cherry picked from commit e4627641)

Stéphane Adjemian authored 3 years ago and Sébastien Villemot committed 3 years ago

(cherry picked from commit f96ed7ad)

Willi Mutschler authored 3 years ago and Sébastien Villemot committed 3 years ago

(cherry picked from commit a3588e28)

Ubuntu 20.04 LTS has Octave 5.2.0, and we want Dynare 4.7 to work on the latest
Ubuntu LTS as of release time.

This is a partial revert of a02a4ce6, which
bumped the minimal requirement from 4.4 to 6.2.0.

(manually cherry-picked from 246d66c0)

Concatenation was failing if the empty object had no frequency set.

Closes #46

Closes: #47

The returned argument is the first input argument.

Conversion to yearly and bi-annual frequencies.

Returned year was wrong for yearly frequency.

The dates2S routine was plain wrong.

H (half year) is still allowed.

Bug introduced in 7bb6a68f when changing the implementation of the
@dates class.

Also:

 - added unit tests,
 - added conversion to bi annual dates.

For all frequencies, counts the number of subperiods since year 0.

First argument, specifying the frequency, can be an integer *or* a character.

This is not necessary since ordering in INFO should not matter, also
this option is not available in Octave 5.x.

The round function in octave does not admit two arguments (the second
being the rounding precision) as in recent versions of Matlab. The same
trick should apply to old Matlab versions, but I do not know when
Mathworks introduced the second argument… A simple solution could be
to always use this trick, and never use the second argument.