Grow the Tier-2 conformance corpus with 13 XPath navigation cases (descendant
and all-element counts, positional and last() predicates, ancestor and
ancestor-or-self axes, following/preceding-sibling, the attribute axis, an
attribute predicate, union, the parent abbreviation, and position()) over a
fixed tree, checked through the validation-driven harness. Own suite.
Part of #105 (Tier 2)
