Collective.easyform

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- Implement PloneFormGen migration.
[buchi, laulaz]

- Fixed errors with ``header_injection`` implementation.
[maurits, thet]

- Format code according to Plone standards: black, isort, zpretty.
[thet]

- Fix Validators for value None: return valid and let required handle it
[Nimo-19]

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- Remove hardcoded download button label check (175)
[davide-targa]

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- Add 'easyform-thankspage' css class to the content-core div if the thankspage is
displayed. Combined with the header_injection field you can style elements
only for the thankspage, for example as a workaround to remove empty
fieldsets (154).
[fredvd]

- do not append the re-rendered download form when generating the
data download file (175)
[mamico, tkimnguyen]

- fix Travis install of google-chrome-stable
[tkimnguyen]

- PEP8 fixes
[mamico]

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- Brazilian Portuguese translation `200 <https://github.com/collective/collective.easyform/issues/200>`_
[ericof]

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- Fix broken image in README (partly addresses 197)
[tkimguyen]

- Mention reCAPTCHA V2 when obtaining public/private key pair
[tkimnguyen]

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NOTE: if you deploy 2.1.1+, the easyform extended validations start working again on fields
in extra field sets (they only worked on the main/default fields). This could cause some
issues if those validators, or default values, were misconfigured in the first place.

- Let ``filter_fields`` return fields in the correct order.
This fixes the order on the default mailer template.
Part of `issue 163 <https://github.com/collective/collective.easyform/issues/163>`_.
[maurits]

- Fixed validation, inline validation, and defaults for fields in fieldsets.
Refs issues `172 <https://github.com/collective/collective.easyform/issues/172>`_
and ` 157 <https://github.com/collective/collective.easyform/issues/157>`_. [fredvd, maurits]

- Moved from dotted to named behaviors.
[iham]

- Avoid potential CannotGetPortalError on startup 164
[laulaz]

- Add collective.z3cform.norobots integration 145
[1letter/gomez]

- For CSV and XML attachments send an empty string if the value is None instead of the string "None"
[nngu6036]

- Put in tests to show recaptcha validation prevents submissions
[djay]

- Fix UnicodeDecodeError while attaching an image to a mail 187
[krissik]

- update instructions for recaptcha functionality
[tkimnguyen]