Copy changes/* into the ChangeLog file for 0.2.5.9
Format_changelog on the 0.2.5.9 changelog
Tidy an entry in the 0259 changelog. Now I like the entries.
Copy 0.2.5.9 entries into ReleaseNotes
Automatically sort and collate ReleaseNotes.

No entries have been removed or edited or added in this commit; no
section names have been changed.  We may need another round of
removal/editing/etc after we edit some section names.  We may want to
re-order items within sections.