Speed-up !SubversionNode.get_entries() by nearly a factor 100.
Speed-up !SubversionNode.get_entries() by nearly a factor 100.

Apparently, it's quite costly to call `fs.revision_root`, so re-using the one from the parent node is a huge win (the `rev` of that revision root is guaranteed to be the same).

Related to #5782.

pkdevbox/trac,pkdevbox/trac,pkdevbox/trac,pkdevbox/trac