Products.zsqlmethods

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- LP 142501: Only connect upon ZODB load if a new flag ``connect_on_load``
has been set to a true value (which is its default for backwards
compatibility).

- LP 142689: Actually use SQL connection titles in the list of
connections returned by SQL.SQLConnectionIDs.

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- Actually establish Zope 2.12 compatibility by dealing with all cases of
moved classes and functions.

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- Made compatible with Zope 2.12.9.

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- Released as separate package.