Hide computers and codes from the list, change the code naming method

[aiida-bot]

Originally reported by: Giovanni Pizzi (Bitbucket: pizzi, GitHub: giovannipizzi)

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Option to hide a computer from the list of computers (verdi computer hide?), same for codes. Maybe hide also all codes of a hidden computer. Maybe also hide codes that do not belong to us, and add a -A option to see them all. Add an option (-a?) to see all codes, even hidden.

Question: where to store the "hidden" property? Probably an updatable attribute, like in calculation:

        self._updatable_attributes = ('hidden')

(actually, also fix the self._updatable_attributes in calculation: should extend the baseclass _updatable_attributes, not overwrite it!)

Also: maybe reference always codes as codename@machinename? So one does not need to define the code name including the machine name!!

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• Bitbucket: https://bitbucket.org/aiida_team/aiida_core/issue/118

[aiida-bot]

Original comment by Andrea Cepellotti (Bitbucket: acepellotti, GitHub: cepellotti):

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Stored an optional updatable attribute "hidden".
Codes listed are codename@computer.
No hidden attribute for computers, I will use the disabled status.