[migration] move 'entities' table changes from 3.19.0 to bootstrap script The 'mtime' and 'source' columns need to go away before we attempt to do anything else with the repo, otherwise any addition of an entity is going to explode.

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−Upstream Author:
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−
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−  %(author)s <%(author-email)s>
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−
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−Copyright:
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−
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−Copyright (c) %(year)s %(author)s.
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−%(author-web-site)s -- mailto:%(author-email)s