Collective.behavior.internalnumber

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- Nothing changed yet.

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- Use `fti.Title()` that is a i18n `Message` instance to manage settings
`portal_types` vocabulary. Also sort vocabulary by term title.
[gbastien]

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- Removed catalog metadata `internal_number`, added upgrade step to 1001.
[gbastien]

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- Made compliant with Plone 4.3, 5.2 and 6.0
[sgeulette]
- Ordered imports & improved docstring
[sgeulette]
- Factorized increment/decrement functionnality in `settings.increment_nb_for`,
`settings.decrement_nb_for` and `settings.decrement_if_last_nb` functions.
Added helper function `settings.set_settings`.
[gbastien]
- Fixed `ConnectionStateError` while setting `registry[TYPE_CONFIG]`
in tests and profile is applied several times.
[gbastien]

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- Initial release.
[sgeulette]