Products-genericsetup

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- On import, avoid clearing indexes whose state is unchanged.

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- Sort profiles on Upgrade form.

- Use clickable labels with checkboxes on import, export and upgrade forms
to improve usability.

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- Avoid using ``manage_FTPGet`` on snapshot exports: that method messes
up the response headers.

- ZopePageTemplate handler: Fix export encoding: since 1.7.0, exports
must be UTF-8 strings

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- Restore the ability to make the setup tool use only import / export
steps explicitly called out by the current profile, ignoring any which
might be globally registered. This is particularly useful for configuring
sites with baseline profiles, where arbitrary add-on steps are not only
useless, but potentially damaging.

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- While importing ``toolset.xml``, print a warning when the class of a
required tool is not found and continue with the next tool. The
previous behaviour could break the install or uninstall of any
add-on, as the missing class may easily be from a different
unrelated add-on that is no longer available in the zope instance.

- Exporters now explicitly only understand strings. The provided
registry handlers encode and decode data automatically to and from
UTF-8. Their default encoding changed from None to UTF-8.
If you have custom registry handlers, ensure that you encode your unicode.
Check especially if you use a page template to generate xml. They return
unicode and their output must also encoded.
If you choose to encode your strings with UTF-8, you can be sure that
your code will also work with GenericSetup < 1.7