Icemac.ab.importer

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- Fixed a missing import which was masked by the Python import bug.

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- Fixing brown bag release: only namespace packages were installed.

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- Using stacked test layers for faster tests.

- Extracted reuseable parts of import wizard to `icemac.addressbook`.

- Adapted code, test set up and tests to run with `icemac.addressbook` version
1.7.

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- Adapted code and tests to run with `icemac.addressbook` version 1.6.

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- Adapted tests and code to run with `icemac.addressbook` version 1.5.

- Dropped `zope.app.testing` test dependency.

- Moved CSS statements to separate file.

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- Adapted code and tests to run with `icemac.addressbook` version 1.4.