Added comments.
Added provisions for date(s) selection.
Fixed typo (wrong numbering of the last unitary tests).
Added provisions for recursive call to @dynSeries/subsasgn overloaded method.
Added new unitary test in @dynSeries/subsasgn overloaded method.
Rewrote @dynSeries/subsasgn.

The following syntaxes are now allowed:

ts{'VARIABLE_NAME'}(range) = data;

where range is a dynDates object and data is an array of doubles, or

ts{'VARIABLE_NAME'}(range) = TS{'OTHER_VARIABLE_NAME'}(range)

where ts and TS are dynSeries objects.
Fixed typo and added unitary test.
Added @dynDate/horzcat method.
Changed the behaviour of @dynSeries/save method when the chosen file name corresponds to an existing file in the same folder.
Fixed display issues for dynDate and dynDates empty objects.