[server] Add missing indices for undo support (closes #3259691) The tables used by the 'undo' feature were missing some indices, which among other things triggered repeated sequential scans when deleting old transactions.

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etc/init.d

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etc/cubicweb.d

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etc/bash_completion.d

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usr/bin

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usr/share/doc/cubicweb-ctl

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var/log/cubicweb

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var/lib/cubicweb/backup

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var/lib/cubicweb/instances