Gandi.cli

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* Fixes Debian packaging

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* Fixes bug with snapshotprofile list command preventing
'gandi setup' to work after clean installation
* Allow Gandi CLI to load custom modules/commands using
'GANDICLI_PATH' environment variable

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* New certificate namespace for managing certificates
* New disk namespace for managing iaas disks
* New snapshotprofile namespace to know which profiles exists
* Allow override of configuration values for apikey, apienv and apihost
using shell environment variables API_KEY, API_ENV, API_HOST.
* Bugfixes on various vm and paas commands
* Fixes typos in docstrings
* Update man page

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* New vhost namespace for managing virtual host for PaaS instances
* New sshkey namespace for managing a sshkey keyring
* Bugfixes on various vm and paas commands
* Bugfixes when using a hostname using only numbers
* Added a random unique name generated for temporary VM and PaaS

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* Initial release