[server] implement dynamic database pooler Opening too much database connection has a cost at startup and also PostgreSQL as a maximum number of connection (100 by default). This get worse when starting multiple wsgi processes, since each process has its own database pool. Instead of opening `connections-pool-size` connections to the database at startup, just open one and open more only when needed.

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etc/init.d

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etc/cubicweb.d

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usr/bin

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var/log/cubicweb

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var/lib/cubicweb/backup

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var/lib/cubicweb/instances