#7 Descriptor::get_total_dimension() is really needed?

[Giuseppe D'Aqui']

Seems to me that we can avoid (and deprecate) the member function Descriptor::get_total_dimension(): when we need the size of a Descriptor we can serialize() it and then get its lenght.
Motivations:
1) possible size inconsistency when modifying the header
2) possible size inconsistency when adding several codec_parameters

[Livio Pipitone]

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Code corrected: now the descriptor total dimension variable is non necessary and, then, not implemented.