[rql2sql] fix relation table scope when some variable from subquery is used. Closes #3252270 While it feels weird to drop this explicit ColumnAlias handling, hg history has no clue on its introduction (prior to rev 0) and no older test case fails without it, so let's drop it.

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−#! /bin/sh -e
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−
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−if [ -x "/etc/init.d/cubicweb-ctl" ]; then
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−    invoke-rc.d cubicweb-ctl restart || true
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−fi
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− 
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− 
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−#DEBHELPER#
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− 
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−exit 0