unification of meta-attributes handling: * remove has_format, has_text_encoding, format, text_encoding methods on Entity * remove rich_text_fields method on EntitySchema * use instead has_metadata / meta_attribute on EntitySchema (from yams) and attribute_metadata on Entity

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#!/usr/bin/env python

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from cubicweb.cwctl import run

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import sys

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run(sys.argv[1:])