A few small changes/fixes to join behaviour, and code cleanup

Fix compilation of cross joins.

Remove the sort clauses on queries when they become subqueries in joins because
then the sorting means nothing (although when take/drop stuff is added the sort
will be relevant, so we'll see about that).

Favour the left side of a join, which is mostly only relevant for the outer
join case (and technically it's not quite right for full-outer joins, maybe,
but I'll get to that later).

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