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Pass Archipelago config file, XSEG pool size and
mapfile check interval configuration values when
instantiating Pithos backend class.

Make the pool size of the pithos backends a configurable setting,
namely PITHOS_BACKEND_POOL_SIZE.

Migrate default settings to files under conf/ for every
Synnefo component.

TODO: Obliterate snf-cyclades-app/synnefo/appt_settings/default/*
and similar files. Make import of synnefo settings common throughout
the code.