Make sure freshly added refs are taken in the same <ul><li> then existing ones so they are sortable together.  See ticket #13271
Update docs/CHANGES.txt

Fixes #13271
Use HTML5 placeholder attribute on search box
Use full links in changelog entries.
Preparing release 2.4.15
Remove bad characters.
Back to development: 2.4.16
Remove a short if block which literally doesn't do anything.
Add an option of searching for related items by path.

This allows users to search with a specific path. A search string such as
'path:/some/path' returns the item at this path and all items in its subtree.