[repository] #1460066: backport datafeed cube as cubicweb source * add some attributes to CWSource to handle this kind of source (not natural to put everything in 'config' string). Adding a CWSource subclass has been attempted then rollbacked because it adds pain to handle multi-sources planning and it introduce an ambiguity on a generic relation (cw_source), which may be a penalty in multiple case * data feed sources are a new kind of source, namely 'copy based', which have no effect on the query planner * a data feed source is associated to a list of url and a parser (appobjects in the 'parsers' registry * entities imported by a data feed have cwuri set to their url on the distant site, their cw_source relation point to the data feed source, though their source stored in the entities table (returned by cw_metainformation) is their physical source, hence 'system'

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# copyright %(year)s %(author)s, all rights reserved.

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# contact %(author-web-site)s -- mailto:%(author-email)s

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#

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%(long-license)s

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"""%(distname)s precreate script, executed at instance creation time or when

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the cube is added to an existing instance, before the schema is serialized.

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This is typically to create groups referenced by the cube'schema.

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"""