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Closes: #205

Closes: #266

Added a unitary test in the overloaded colon method of the dynDate class, using the new feature introduced in the previous commits.

Changed subsref overloaded method (dynDate): added a new interface to populate empty dynDate objects with specified frequency. Added unitary test.

For instance if we instantiate an empty dynDate object for quaterly dates:

qq = dynDate('Q');

Then we can populate this object as follows (2009 second quarter):

d1 = qq(2009,2);

Added the possibility to instantiate empty quaterly, monthly or weekly dynDate objects. Added unitary test.

Changed behavior  of ne overload method (dynDate) as in commit ##9dc16fc765bfd8957dbe24a2ac1244fbde1edf09. Removed useless variable. Updated copyright.

Changed behavior of eq overloaded method (dynDate class). Trigger an error message if the two compared objects have no common frequency.

Allow to populate an empty dynDate object or update a dynDate object. For instance, if we instantiate
the dynDate class as follows:

a = dynDate()

a is an empty dynDate object. We can "populate" this object as follows

a('1938Q4')

Note however that a ins not modified in place (due to a limitation of Octave's class design), a copy
has to be made.