Ftw.upgrade

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- Migration: skip invalid relations. [jone]

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- Added support for jQuery 1.9+ on manage-upgrades control panel. [neilferreira]

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- Fix NoneType AttributeError with newest requests module. [jone]

- Drop Plone 4.1 and 4.2 support. [jone]

- Implement inplace migrator. [jone]

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- Add option to force reinstall already installed profiles. [jone]

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- Disable automatic CSRF protection for authorized jsonapi requests. [jone]

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- Provide the attributes ``base_profile`` and ``target_version`` on
upgrade steps when using the ``upgrade-step:directory`` directive. [jone]

- Fix profile version when using `upgrade-step:directory` and
having old upgrade steps but no new ones. [jone]