Add a ``schema`` command to cmd ctrl to generate schema image. This changeset add the new commande and do some refactoring in cwconfig and schema.py to allow the use of CubicWebNoAppConfiguration with CubicWebSchemaLoader.

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#! /bin/sh -e

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case "$1" in

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    remove)

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	if [ -x "/etc/init.d/cubicweb-ctl" ]; then

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	    invoke-rc.d cubicweb-ctl stop || true

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	fi

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    ;;

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esac

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#DEBHELPER#

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exit 0