Ftw.usermanagement

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- Nothing changed yet.

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- Save emails with lower case letters when creating a new user. [tinagerber]

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- Add a basic user export to the user_management`-view.
It exports all member properties and the assigned groups of the users.
[elioschmutz]

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- Fix bug causing that the "Site Administrators" group causes errors. [jone]

- Add "User Manager" role. [jone]

- Fix translation of users management action. [jone]

- Drop support for Plone 4.1 because the dependency `ftw.tabbedview` has
dropped support for Plone 4.1 too. [mbaechtold]

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- Fix change-password url in mails to point to Plone's form. [jone]

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- Remove includeDependencies statement.
[jone]

- Add constraint to ftw.upgrade dependency.
We require at least the version where ftw.upgrade has added the
upgrade-step:directory directive.
[jone]