revset: get revision number of each node from target namespaces Before this patch, revset predicate "named()" uses each nodes gotten from target namespaces directly. This causes problems below: - combination of other predicates doesn't work correctly, because they assume that revisions are listed up in number - "hg log" doesn't show any revisions for "named()" result, because: - "changeset_printer" stores formatted output for each revisions into dict with revision number (= ctx.rev()) as a key of them - "changeset_printer.flush(rev)" writes stored output for the specified revision, but - "commands.log" invokes it with the node, gotten from "named()" - "hg debugrevspec" shows nodes (= may be binary) directly Difference between revset predicate "tag()" and "named('tags')" in tests is fixed in subsequent patch.