[vreg] move base registry implementation to logilab.common. Closes #1916014 A new logilab.common.registry module has been created with content from * cw.vreg (the whole things that was in there) * cw.appobject (base selectors and all). In the process, we've done some renaming: * former selector functions are now known as "predicate", though you still use predicates to build an object'selector * hence `objectify_selector` decorator is now `objectify_predicate` * the top level registry is now `RegistryStore` (was `VRegistry`) Also there is no more need for the @lltrace decorator. On the CubicWeb side, the `selectors` module has been renamed to `predicates`. There should be full backward compat with proper deprecation warnings.

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#! /bin/sh -e

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case "$1" in

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    purge)

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	rm -rf /etc/cubicweb.d/

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	rm -rf /var/log/cubicweb/

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	rm -rf /var/lib/cubicweb/

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    ;;

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esac

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#DEBHELPER#

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exit 0