Collective-searchandreplace

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- Nothing changed yet.

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- Do not show "Replace" button until user has seen Preview results.
[gotcha]

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- Made "Find What" field required and allow empty "Replace With".
Fixes `issue 43 <https://github.com/collective/collective.searchandreplace/issues/43>`_.
[spereverde]

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- use pytest as test runner
[gotcha]

- Enable search and replace on lines fields, Archetypes ``ILinesField`` and dexterity ``ITuple`` with ``value_type==ITextLine``
Can be enabled with registry ``include_lines_fields`` to True
[gotcha]

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- use safe_unicode from CMFPlone
[maurits, gotcha]

- Enable search and replace on string fields, Archetypes ``IStringField`` and dexterity ``ITextLine``
Can be disabled with registry ``include_textline_fields`` to False
[gotcha]

- Translate field names in preview table
[gotcha]

- Python 3 support for 5.2
[gotcha]

- Major refactoring for readability
[gotcha]

- Added update_modified setting to allow replacing without updating the modified index/metadata. [Gagaro]

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- Fixed ImportErrors when dexterity is not available. [maurits]