[schema2sql] properly consider skip_relations parameters. This is the same bug as yams #286912. Also, introducing a unique function telling if the relation should have a table or not unhide some other problems related to computed relation, or missing skipped relations information.

#!/usr/bin/make -f

export NO_SETUPTOOLS=1

%:
	dh $@ --with python2

override_dh_auto_install:
	dh_auto_install
	# remove generated .egg-info file
	rm -rf debian/*/usr/lib/python*

override_dh_python2:
	dh_python2 -i /usr/share/cubicweb