Products.cmfcore

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- Fix content exportimport when Title or Description are unicode.

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- Make the error raised when trying to rename an instance of ImmutableId
indicate the id of the object.

- DateTime 2.12.5 does away with a special case representing
DateTime values for midnight (00:00:00) without their time and
time zone values. So DateTimes formerly rendered as
``2010/01/01`` in the UTC timezone now render as
``2010/01/01 00:00:00 UTC``. Several unit tests that relied on
the old-style representation had to be fixed.

- Get most tests working under Zope 2.13.0a2.

- Added dependency on the new ``Products.ZSQLMethods`` distribution and updated
Zope2 requirement accordingly.

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- Backport test setup fixes for Zope 2.13 compatibility.

- Use the standard libraries doctest module.

- Updated setDefaultRoles to use the addPermission API if available.

- Updated test to work with zope.contenttype >= 3.4.3.

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- Actions and TypeInformation: Clear the compiled NNN_expr_object
property when the NNN_expr property is cleared.

- Actions: Return None if 'link_target' is an empty string.
This helps to avoid invalid empty 'target' attributes in HTML output.

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- Changed GenericSetup import handlers to fail silently if they
are called in a context that does not contain the items they
import.

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- TypesTool: Made it an ordered container.
This allows to control the order of the add actions.

- TypeInformation: Removed redundant 'content_icon' property.
For backwards compatibility old settings containing 'content_icon' instead
of 'icon_expr' are converted on import. CMFDefault provides the necessary
upgrade steps for migrating existing sites.

- DynamicType: Added 'getIconURL' method.
This replaces the now deprecated 'getIcon' method.

- TypeInformation: Added 'getIconExprObject' method.
This replaces the now deprecated 'getIcon' method.