[querier] introduce RepeatList class, used to optimize size of data returned for result set description When rql query has no ambiguity, we used to return the same description * N where N is the size of the result set. Returning RepeatList class avoid that multiplication. According to quick benchmark this improve performance for result set whose size is ~ > 50, has very small penalty for rset < 50, and in any case improve the size of data to be transfered over the network through pyro connection.

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# type attribute might already be there if migrating from

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# version < 3.5 to version >= 3.5.3, BaseTransition being added

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# in bootstrap_migration

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if versions_map['cubicweb'][0] >= (3, 5, 0):

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    add_attribute('BaseTransition', 'type')

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    sync_schema_props_perms('state_of')

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    sync_schema_props_perms('transition_of')