cubicweb #1945733 [rql2sql] handle access to attribute/inlined relation on a variable coming from a subquery [open]

this currently raises a BadRQLQuery.

Though documented, the point is that a same query may be correct or not according to 'inlinness' of a relation, eg

Any X, Y WHERE X relation Y WITH X BEING ...

will crash if Y is inlined, but else will execute fine

done in<not specified>
load left1.000
closed by<not specified>