Ftw.upgrade

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- Make "blessed" dependency optional in the "colors" extras.
[jone]

- Update references to class-migrated objects in the intid utility.
[deiferni]

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- Migrate workflow states with wfhistory migration and do not set state manually unless necessary.
[tschanzt]

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- Add an afterCommitHook that notifies about the transaction having been
committed (or aborted) after installing upgrades.
[lgraf]

- Fix authentication problem with bin/upgrade command.
[jone]

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- Return context manager to allow "as" statements.
[lknoepfel]

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- Update quickinstaller product version when upgrading a package.
[jone]

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- Fix post upgrade ordering which was broken since 1.11.0.
[jone]