[dataimport] Add a ``flush`` method for all stores. For ``ObjectStore``, ``RQLObjectStore`` and ``NoHookRQLObjectStore`` the method tries to call the ``commit`` method. For ``SQLGenObjectStore``, the ``flush`` method is basically unchanged with respect to previous changesets.

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include *.py

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include */*.py

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recursive-include data *.gif *.png *.ico *.css *.js

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recursive-include i18n *.po

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recursive-include wdoc *