cubicweb #809460 checking of for name conventions in attributes [open]

There are some valid schemas (from a yams point of view) which cannot be used in CW because of RQL restrictions, mainly in the naming of entities and their attributes.

my current issue is an attribute with a name starting with an underscore: db-create works fine, RQL fails with syntax error.

The checking performed on entity names (in cubicweb.schema.CubicwebSchema.add_entity_type should be generalized to other names which have limitations.

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