Imio.helpers

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- Generated universal wheel version.
[sgeulette]

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- Improved `emailer.send_email` to use send in place of securesend (not using queue).
[sgeulette]
- Added `EMPTY_DATETIME` value that corresponds to `01/01/1950 at 12:00`.
[gbastien]
- Improved batching module
[sgeulette]
- Added `batching.can_delete_batch_files`
[sgeulette]

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- Added "empty" variables to handle empty indexes searches.
[sgeulette]

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- Added `temp_disable_link` JS helper that will disable a link for 2 seconds
and to avoid double clicks.
[gbastien]

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- Added batching module.
[sgeulette]
- Fixed the way JS function `submitFormHelperOnsuccessDefault` manages
returned result when it is a file, now we have a correct `filename`.
[gbastien]
- Added transmogrifier Expression and Condition classes to log expression
compilation or interpretation errors.
[sgeulette]
- Removed `content.safe_encode` as already defined in `imio.pyutils`.
Import it from `imio.pyutils` in `imio.helpers.content` for temporary backward
compatibility, to be removed.
[gbastien]
- Overrided `folder_contents` to make it work with `DashboardCollection`.
[gbastien]
- Monkeypatched `plone.app.querystring.registryreader.getVocabularyValues`
to keep vocabulary order onloy for Plone4, behavior is correct in Plone5+.
Manage every `HAS_PLONE_X` values.
[gbastien]

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- Made compliant with Plone 4, Plone 5, Plone 6
[boulch, laulaz, sgeulette]
- Require `pathlib2` in `setup.py`, backport `pathlib` for `py2.7`.
[gbastien]
- Added `security.setup_app` to be used in run scripts.
[sgeulette]
- Added `setup.load_xml_tool_only_from_package` to load only main tool xml file.
[sgeulette]
- Added `setup.test_remove_gs_step` to remove a generic setup step.
[sgeulette]
- Added `imio.helpers.YesNoForFacetedVocabulary`
[sgeulette]
- Fixed `content.base_getattr` that was not returning the `default` if attribute
not existing.
[gbastien]