Taxonomy csv import/export 7.x-5.10, 2012-02-22

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Issue #1410784 by Daniel Berthereau: Added import/export of multivalued fields.
By Daniel Berthereau: Simplified import UI: only three generic import formats.
By Daniel Berthereau: Removed old code from 6.x in order to use only Field API.
By Daniel Berthereau: Clarified import of translations.
By Daniel Berthereau: Added export of translations.

Taxonomy csv import/export 7.x-5.10, 2012-02-22
Taxonomy csv import/export 6.x-5.10, 2012-02-22
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By Daniel Berthereau: Updated documentation and checked code with Coder.

Taxonomy csv import/export 6.x-5.10, 2012-02-22
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By Daniel Berthereau: Added a full export format compatible with Taxonomy CSV 7.