[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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.. winclude:: search_sample_queries

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You can as well type complex queries using the RQL_ query language, 

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used every where to build dynamic pages of this site.

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You can use one of the following prefixes to specify which kind of search you

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want: 

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* `rql` : RQL query

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* `text` : full text search

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.. _RQL: doc/tut_rql