[server.rqlannotation] rename SQLGenAnnotator to RQLAnnotator This class is in charge of annotating the RQL syntax tree with various bits of information, like (in)variance, use of full-text-index, etc. It is a needed step before the generation of SQL, but does not touch SQL directly. Hence RQLAnnotator seems a better name.

3.28
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Changes
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- the class cubicweb.view.EntityAdapter was moved to cubicweb.entity.EntityAdapter
  a deprecation warning is in place, but please update your source code accordingly.